Programming PHP

print_r($a);Array
(
[0] => Fred
[1] => Flintstone
[2] => 35
)
Pass references to variables to have the fields stored in those variables. The number
of fields assigned is returned:
$string = "Fred\tFlintstone (35)";
$n = sscanf($string, "%s\t%s (%d)", &$first, &$last, &$age);
echo "Matched n fields: $first $last is $age years old";
Fred Flintstone is 35 years old
String-Searching Functions
Several functions find a string or character within a larger string. They come in three
families: strpos( ) and strrpos( ), which return a position; strstr( ), strchr( ), and
friends, which return the string they find; and strspn( ) and strcspn( ), which return
how much of the start of the string matches a mask.
In all cases, if you specify a number as the “string” to search for, PHP treats that
number as the ordinal value of the character to search for. Thus, these function calls
are identical because 44 is the ASCII value of the comma:
$pos = strpos($large, ","); // find last comma
$pos = strpos($large, 44); // find last comma
All the string-searching functions return false if they can’t find the substring you
specified. If the substring occurs at the start of the string, the functions return 0.
Because false casts to the number 0, always compare the return value with === when
testing for failure:
if ($pos === false) {
// wasn't found
} else {
// was found, $pos is offset into string
}
Searches returning position
The strpos( ) function finds the first occurrence of a small string in a larger string:
$position = strpos(large_string, small_string);
If the small string isn’t found, strpos( ) returns false.
The strrpos( ) function finds the last occurrence of a character in a string. It takes
the same arguments and returns the same type of value as strpos( ).
For instance:
$record = "Fred,Flintstone,35,Wilma";
$pos = strrpos($record, ","); // find last comma
Manipulating and Searching Strings | 93
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