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<?php
$string = "Hello World!";
$pattern = "/o/";
$replacement = "0";
$result = preg_replace($pattern, $replacement, $string);
echo $result; // Output: Hell0 W0rld!
?>
xxxxxxxxxx
<?php
$string = 'The quick brown fox jumps over the lazy dog.';
$patterns = array();
$patterns[0] = '/quick/';
$patterns[1] = '/brown/';
$patterns[2] = '/fox/';
$replacements = array();
$replacements[2] = 'bear';
$replacements[1] = 'black';
$replacements[0] = 'slow';
echo preg_replace($patterns, $replacements, $string);
?>