It returns part of a string

Example

<?php
echo substr(“phpcode”,2,4);
?>

Output

pcod

It replace text within a portion of a string

Example

<?php
echo substr_replace(“php code”,”codez”,4);
?>

Output

php codez

It counts the number of substring occurrences

Example

<?php
echo substr_count(“phpcode. phpcodez”,”code”);
?>

Output

2

It compares two strings from a specified start position

This function returns:
0 – if the two strings are equal
<0 – if string1 (from startpos) is less than string2
>0 – if string1 (from startpos) is greater than string2
If length is equal or greater than length of string1, this function returns FALSE

Example

<?php
 echo substr_compare("phpcodexc","phpcode",0);
 ?>

Output

2

It translate characters or replace substrings

Example

<?php
echo strtr(“One Two”,array(“One” => “PHP”, “Two” => “HTML”));
?>

Output

PHP HTML

It makes a string uppercase

Example

<?php
echo strtoupper(“PHPCode”);
?>

Output

PHPCODE

It makes a string lowercase

Example

<?php
echo strtolower(“PHPCode”);
?>

Output

phpcode

It splits a string into smaller strings

Example

<?php
$tokenVal = strtok(“php html js”, ” “);
while ($tokenVal  != false) {
echo $tokenVal .” “;
$tokenVal =strtok(” “);
}
?>

Output

php html js

It finds the first occurrence of a string

Example

<?php
echo strstr(“phpcode”,”co”);
?>

Output

code

It returns the number of characters found in the string that contains only characters from the charlist.

Example

<?php
echo strspn(“phpcodephp”,”phpe”);
?>

Output

3