It finds the position of the first occurrence of a substring in a string

Example

<?php
echo strpos(“phpcode”,”co”);
?>

Output

3

It searches a string for any of the specified characters.

Example

<?php
echo strpbrk(“phpcode”,”co”);
?>

Output

code

It compares  first n characters (case-sensitive) of a strings

Example

<?php
echo strncmp(“phpcode”,”codez”,7);
?>

Output

1

It compares two strings

Example

<?php
echo strncasecmp(“phpcode”,”codez”,7);
?>

Output

13