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

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

Example

<?php
echo strrpos(“phpcodeccr”,”p”);
?>

Output

2

It find the position of the last occurrence of a  substring in a string(case-insensitive)

Example

<?php
echo strripos(“phpcodeccr”,”c”);
?>

Output

8

It reverse a string

Example

<?php
echo strrev(“phpcodeccr”);
?>

Output

rccedocphp

It finds the last occurrence of a character in a string

Example

<?php
echo strrchr(“phpcodeccr”,”co”);
?>

Output

cr

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