Programming PHP

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strtr string strtr(string string, string from, string to) Returns a string created by translating in string every occurrence of a character in from to the character in to with the same position. strval string strval(mixed value) Returns the string equivalent for value. Ifvalue is a nonscalar value (object or array), the function returns an empty string. substr string substr(string string, int offset[, int length]) Returns the substring of string. Ifoffset is positive, the substring starts at that character; if it is negative, the substring starts at the character offset characters from the string’s end. If length is given and is positive, that many characters from the start of the substring are returned. If length is given and is negative, the substring ends length characters from the end of string. Iflength is not given, the substring contains all characters to the end of string. substr_count int substr_count(string string, string search) Returns the number of times search appears in string. substr_replace string substr_replace(string string, string replace, string offset[, int length]) Replaces a substring in string with replace. The substring replaced is selected using the same rules as those of substr( ). symlink int symlink(string path, string new) Creates a symbolic link to path at the path new. Returns true if the link was successfully created and false if not. 450 | Appendix A: Function Reference This is the Title of the Book, eMatter Edition Copyright © 2002 O’Reilly & Associates, Inc. All rights reserved.
syslog int syslog(int priority, string message) Sends an error message to the system logging facility. On Unix systems, this is syslog(3); on Windows NT, the messages are logged in the NT Event Log. The message is logged with the given priority, which is one of the following (listed in decreasing order of priority): If message contains the characters %m, they are replaced with the current error message, if any is set. Returns true if the logging succeeded and false if a failure occurred. system string system(string command[, int return]) Executes command via the shell and returns the last line of output from the command’s result. If return is specified, it is set to the return status of the command . tan double tan(double value) Returns the arc tangent of value in radians. tempnam string tempnam(string path, string prefix) Generates and returns a unique filename in the directory path. Ifpath does not exist, the resulting temporary file may be located in the system’s temporary directory. The filename is prefixed with prefix. Returns a null string if the operation could not be performed. time LOG_EMERG Error has caused the system to be unstable LOG_ALERT Error notes a situation that requires immediate action LOG_CRIT Error is a critical condition LOG_ERR Error is a general error condition LOG_WARNING Message is a warning LOG_NOTICE Message is a normal, but significant, condition LOG_INFO Error is an informational message that requires no action LOG_DEBUG Error is for debugging only int time( ) Returns the current Unix timestamp. This is the Title of the Book, eMatter Edition Copyright © 2002 O’Reilly & Associates, Inc. All rights reserved. time | 451
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Programming PHP
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Programming PHP by Rasmus Lerdorf a
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Colophon Our look is the result of
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Accessing Individual Characters 79
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Concealing PHP Libraries 293 PHP Co
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clarify the explanations, and the p
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There is a web page for this book,
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Chapter 2 CHAPTER 2 Language Basics
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Comments Comments give information
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*/ echo("l=$l m=$m n=$n\n"); ?> Now
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change. Constants are referred to b
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PHP recognizes floating-point numbe
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• The empty string ("") and the s
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Chapter 6 describes classes and obj
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The old value of $black is lost. In
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update_counter( ); update_counter(
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Table 2-3. PHP operators P A Operat
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The division and multiplication ope
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Autoincrement and Autodecrement Ope
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Bitwise Operators The bitwise opera
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something is true. For example, you
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Because all operators are required
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if The if statement checks the trut
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A switch statement is given an expr
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if ($i == 5) break; // breaks out o
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This program adds the numbers from
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loops, and complain if the file bei
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XML Style Because of the advent of
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and other such niceties. Some will
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Chapter 3 CHAPTER 3 Functions A fun
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Typically, functions return some va
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As we discussed in Chapter 2, the e
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Example 3-5. Doubler redux function
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Missing Parameters PHP lets you be
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Anonymous Functions Some PHP functi
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echo "$who was $where"; Kilroy was
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As a special case, you can put a se
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• A padding specifier denoting th
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Boolean values and NULL are not mea
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Changing Case PHP has several funct
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The quote_style and charset argumen
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Query-string encoding The urlencode
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The comparison operators (=) also w
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The Levenshtein algorithm calculate
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The str_repeat( ) function takes a
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print_r($a);Array ( [0] => Fred [1]
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The c in strcspn( ) stands for comp
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These three kinds of patterns can b
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Subpatterns You can use parentheses
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Table 4-8. POSIX anchors Anchor Mat
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Example 4-1. Credit-card validator
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Character Classes Perl-style regula
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Trailing Options Perl-style regular
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A simple use of positive lookahead
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For example: preg_match('/y.*e$/',
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Pass an array of strings as subject
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Quoting for regular expressions The
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Identifying Elements of an Array Yo
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array is almost always a programmer
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Two or more consecutive commas in t
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echo "true!\n"; } if (array_key_exi
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EXTR_PREFIX_SAME, which says that t
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echo "$key is $value\n"; } 0 is spa
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The default argument, if provided,
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you need to answer questions like
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Example 5-3. Sorting arrays (contin
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Here’s how to randomize the order
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Sets Arrays let you implement the b
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Here’s the output from Example 5-
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Terminology Everyobject-oriented la
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You can use variable variables with
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} function set_name ($new_name) { $
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The object created bythe Person con
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Example 6-1. Displaying all declare
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Example 6-2. Object introspection f
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Here are some sample classes and ob
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PHP has two hooks for objects durin
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Example 6-5 shows the file next.php
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the request contains a blank line,
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SERVER_NAME The hostname, DNS alias
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The biggest difference between GET
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Figure 7-1. The chunkify form and i
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Example 7-4. Temperature conversion
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Example 7-6. Multiple selection val
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Example 7-8. Sticky multivalued che
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Files are stored in the server’s
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“me@aol” by requiring an at sig
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To mark a document as already expir
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A third technique for maintaining s
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Example 7-10. Preference selection
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Session basics To enable sessions f
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Custom storage By default, PHP stor
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When a session is completed, the de
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Chapter 8 CHAPTER 8 Databases PHP h
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columns, each of which has a name a
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Figure 8-1. The movie page the data
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$db = DB::connect($datasource); if
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string(4) "1962" ["name"]=> string(
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The executeMultiple( ) method takes
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echo "$k"; if (is_array($v)) { a_to
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Two HTML forms are needed to popula
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Example 8-3. Database connection ab
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Example 8-4. Backend administration
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Example 8-5. Adding a business (con
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Example 8-5. Adding a business (con
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The business listings page is illus
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The series of requests sent by the
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many colors as you need. The latter
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image-generating function. Example
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Example 9-4. Adding text to an imag
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Example 9-6. Displaying vertical Tr
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Example 9-8. Caching dynamic button
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You can also take this a step furth
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For a signed integer, the leftmost
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True Color Color Indexes The color
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Chapter 10 CHAPTER 10 PDF Adobe’s
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Figure 10-1. Hello world in a PDF d
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Type, Content-Disposition, and Cont
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Example 10-3. Changing the origin (
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Example 10-4. Text alignment within
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Example 10-5. Changing text attribu
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usr/share/fonts FontAFM LuciduxSans
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Adding an image to a PDF document i
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Example 10-8. Nonproportional scali
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Figure 10-9. A sample path The pdf_
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The width and height parameters spe
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Example 10-11. Using a template Th
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Example 10-12. Using bookmarks and
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Example 10-13. Specifying a link (c
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Figure 10-16. Closed note The conte
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In HTML, you often have an open tag
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Example 11-1. Generating an XML doc
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The end element handler is called w
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If your external entity reference h
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characters outside the target encod
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XML_ERROR_BAD_CHAR_REF XML_ERROR_BI
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Figure 11-2. Book details comment).
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Example 11-10. bookparse.xml (conti
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Example 11-12. News XSL transform
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more information). The xmlrpc exten
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equest, but it doesn’t know how t
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Chapter 12 CHAPTER 12 Security PHP
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These directives ensure that PHP er
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Restrict Filesystem Access to a Spe
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function or PHP’s copy( ) functio
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• Any system call (through functi
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You can globally disable particular
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Chapter 13 CHAPTER 13 Application T
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user.template. It uses the {DESTINA
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{ARTICLE} might be useful, as it wo
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} ob_start('rewrite'); ?> Visit our
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To turn off error reporting entirel
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Example 13-5. Log-rolling error han
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Before you begin optimization, ask
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changes you make to your code as yo
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• Only include or require files t
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MySQL replication Sometimes the dat
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Chapter 14 CHAPTER 14 Extending PHP
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examples, and you are strongly enco
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int Integer/long long Same as int a
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zend_module_entry rot13_module_entr
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for(i=0, ch=arg; i= 'A')&&(*ch
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if (extension_loaded($module)) { $s
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SWF_DIR=$i AC_MSG_RESULT(found in $
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If you compile the Apache module ve
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For example: zval **old, *new; *new
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The value returned from a PHP funct
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A More Complex Example Here’s an
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Table 14-4. RETURN-related convenie
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* ... */ }; PHP_MINIT_FUNCTION(foo)
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using SEPARATE_ZVAL( ), initializes
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The struct looks like this in the p
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zend_hash_update(&EG(symbol_table),
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Resources A resource is a generic d
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Chapter 15 CHAPTER 15 PHP on Window
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3. Windows 95/98/Me: the Windows sy
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Then explicitly load the module wit
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un under IIS, you will need to reim
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External Commands PHP uses the defa
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This creates a reference (VT_BYREF)
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Figure 15-3. Gleaning syntax from W
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Now we can complete the invoice wit
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multiple Workbooks, each of which c
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Example 15-4. Querying Excel via OD
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• Applications that want to use t
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Example 15-5. Add new phone number,
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Files, directories, and filesystem
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addcslashes string addcslashes(stri
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array_merge array array_merge(array
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array_search mixed array_search(mix
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asort void asort(array array[, int
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call_user_func mixed call_user_func
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chown bool chown(string path, mixed
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cos double cos(double value) Return
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Any characters in the format string
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each array each(array array) Create
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Any number of these options can be
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fflush int fflush(int handle) Commi
Page 400 and 401: filemtime int filemtime(string path
Page 402 and 403: If include is specified and is true
Page 404 and 405: ftell int ftell(int handle) Returns
Page 406 and 407: get_current_user string get_current
Page 408 and 409: get_parent_class string get_parent_
Page 410 and 411: getmypid int getmypid( ) Returns th
Page 412 and 413: header void header(string header[,
Page 414 and 415: implode string implode(array string
Page 416 and 417: is_double bool is_double(mixed valu
Page 418 and 419: is_scalar bool is_scalar(mixed valu
Page 420 and 421: Calculates the Levenshtein distance
Page 422 and 423: log double log(double number) Retur
Page 424 and 425: mkdir int mkdir(string path, int mo
Page 426 and 427: number_format string number_format(
Page 428 and 429: openlog int openlog(string identity
Page 430 and 431: parse_url array parse_url(string ur
Page 432 and 433: phpinfo void phpinfo([int what]) Ou
Page 434 and 435: printf int printf(string format[, m
Page 436 and 437: eaddir string readdir(int handle) R
Page 438 and 439: ound double round(double number[, i
Page 440 and 441: setlocale string setlocale(mixed ca
Page 442 and 443: sort void sort(array array[, int fl
Page 444 and 445: str_pad string str_pad(string strin
Page 446 and 447: %H Hour in 24-hour format, includin
Page 448 and 449: strncmp int strncmp(string one, str
Page 452 and 453: tmpfile int tmpfile( ) Creates a te
Page 454 and 455: unregister_tick_function void unreg
Page 456 and 457: wordwrap string wordwrap(string str
Page 458 and 459: old versions of aspell, you should
Page 460 and 461: DBM For very simple database instal
Page 462 and 463: Hyperwave Hyperwave is a database f
Page 464 and 465: mcrypt This extension provides an i
Page 466 and 467: pdflib pdflib provides support for
Page 468 and 469: Sybase This extension provides supp
Page 471 and 472: Symbols & (ampersand) &= (bitwise A
Page 473 and 474: | (vertical bar) |= (bitwise OR ass
Page 475 and 476: aspell PHP library, 457 assert() fu
Page 477 and 478: checksums mhash library, 464 valida
Page 479 and 480: cryptography mcrypt extension, 464
Page 481 and 482: DTD (Document Type Definition), 263
Page 483 and 484: System V Semaphores and Shared memo
Page 485 and 486: calling, 61 for each array element,
Page 487 and 488: H hash mark (#) in comments, 19 hea
Page 489 and 490: interlacing GIF images, 246 interna
Page 491 and 492: masks, using in string searches, 94
Page 493 and 494: serialization of, 153-157, 438 _ _s
Page 495 and 496: pdf_open_file() function, 234 pdf_p
Page 497 and 498: with echo, 76 with print() function
Page 499 and 500: S Sablotron C library (XSLT support
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sql_regcase() function, 443 sqrt()
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tan() function, 451 target encoding
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function parameters, 33 functions f
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xml_set_unparsed_entity_decl_handle
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