warning: cannot yet handle MBCS in html_entity_decode pada pasangan Joomla dan Xampp

You need to process each character in a string individually.
Solution

Loop through each character in the string with for. This example counts the vowels in a string:
$string = “This weekend, I’m going shopping for a pet chicken.”;
$vowels = 0;
for ($i = 0, $j = strlen($string); $i < $j; $i++) {
if (strstr(’aeiouAEIOU’,$string[$i])) {
$vowels++;
}
}
Discussion

Processing a string a character at a time is an easy way to calculate the “Look and Say” sequence:
function lookandsay($s) [...]

Continue reading about Processing a String One Character at a Time

You want to replace a substring with a different string. For example, you want to obscure all but the last four digits of a credit card number before printing it.
Solution
Use substr_replace( ):
// Everything from position $start to the end of $old_string
// becomes $new_substring
$new_string = substr_replace($old_string,$new_substring,$start);
// $length characters, starting at position $start, become $new_substring
$new_string = [...]

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You want to extract part of a string, starting at a particular place in the string. For example,
you want the first eight characters of a username entered into a form.
Solution
Use substr( ) to select your substrings:
$substring = substr($string,$start,$length);
$username = substr($_REQUEST['username'],0,8);
Discussion
If $start and $length are positive, substr( ) returns $length characters in the string, starting at [...]

Continue reading about Accessing Substrings