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In php, stripos() performs case sensitive searching of a character and returns its position. But in the following code, position of the character L is returned irrespective of its case sensitivity.
<?php
$a = array('hello','world');
foreach($a as $val) {
echo $val;
echo stripos($val, 'L'); //returns hello2world3
}
?>
From php documentation
stripos is for case-insensitive search.
If you want case sensitive search then you should use strpos.