ZEND PHP 5 Certification STUDY GUIDE

Strings And Patterns ” 77
Transforming a String
The strtr() function can be used to translate certain characters of a string into other
characters—it is often used as an aid in the practice known as transliteration to transform
certain accented characters that cannot appear, for example, in URLs or e-mail
address into the equivalent unaccented versions:
// Single character version
echo strtr (’abc’, ’a’, ’1’); // Outputs 1bc
// Multiple-character version
$subst = array (
’1’ => ’one’,
’2’ => ’two’,
);
echo strtr (’123’, $subst); // Outputs onetwo3
Using Strings as Arrays
You can access the individual characters of a string as if they were members of an
array. For example:
$string = ’abcdef’;
echo $string[1]; // Outputs ’b’
This approach can be very handy when you need to scan a string one character at a
time:
Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)
$s = ’abcdef’;
for ($i = 0; $i < strlen ($s); $i++) {
if ($s[$i] > ’c’) {
echo $s[$i];
}
}