- strstr: documentation ( source)
<?php
$haystack = 'this is a verygood school of sachin';
$pattern = 'sch';
for ($i = strlen($haystack); $i > 0; $i--) {
echo $i . ' ';
}
echo '<br>';
for ($i = 0; $i < strlen($haystack); $i++) {
echo $haystack[$i] . ' ';
}
$match = strstr($haystack, $pattern);
$result = strlen($match) - strlen($pattern);
echo $result;
?>