PHP substr_count() Function

PHP substr_count() Function

The substr_count() function in PHP counts the number of times a substring occurs in the specified string.

Syntax

substr_count ( string $haystack , string $needle [, int $offset  [, int $length ]] )

Parameter

haystack(required)- This parameter signifies the string to search in.

needle (required)- This parameter represents the substring to search for.

offset (optional)- This parameter represents the offset where to start counting, and the default value is 0. If it is negative, counting starts from the end of the string.

length (optional)- It signifies the length of the search after the specified offset to search for the substring. If it is negative, the length counts from the end of haystack. If the sum of offset and length is greater than the haystack length, it outputs a warning.

Return

This function returns the number of times the substring occurs in the string.

Example 1

Output

String 1: Hello PHP! This is my PHP example.
String 2: PHP
After the substr_count() function...
The returned value: 2 

Example 2

Output

String 1: Hello PHP! This is my PHP example.
String 2: PHP
After the substr_count() function...
The returned value: 2 

Example 3

Output

String 1: Hello PHP! This is my PHP example.

After the substr_count() function...
The returned value: 0

Example 4

 33
 $count = substr_count($str1, 'is', 33, 3);
 echo "\nThe returned value: ".$count; // 
 ?> 

Output

PHP Warning:  substr_count(): Invalid length value in /workspace/Main.php on line 8