- substr: documentation ( source)
- stristr: documentation ( source)
- str_replace: documentation ( source)
<?php
echo strlen("abcd");
$s = "arc";
echo "count: " . strlen($s) . "\n";
$string = "Marcus";
$rest = $string;
do {
$rest = stristr($rest,$s);
echo "rest: $rest\n";
$s3 = substr($rest,0,strlen($s)+1);
$string = str_replace($s3,"<$s3>",$string);
echo "s3: $s3\n";
$rest = substr($rest,strlen($s)+1);
echo "rest: $rest\n";
echo "=======\n";
} while ($rest != false);
echo "string: $string\n";