I found something strange
<?php
$string = 'The quick brown fox jumped over the lazy dog.';
$patterns[0] = '/quick/';
$patterns[1] = '/brown/';
$patterns[2] = '/fox/';
$replacements[2] = 'bear';
$replacements[1] = 'black';
$replacements[0] = 'slow';
echo preg_replace($patterns, $replacements, $string);
?>
Output The bear black slow jumped over the lazy dog.
But when you swap the replacements like
$replacements[0] = 'slow';
$replacements[2] = 'bear';
$replacements[1] = 'black';
you get The slow bear black jumped over the lazy dog.
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