w3resource

PHP: substr_count() function

Description

The substr_count() function is used to count the number of times a substring occurs in a string. Note that substring is case sensitive.

Version:

(PHP 4 and above)

Syntax:

substr_count(string1, string2, nstart, nlength)

Parameters:

Name Description Required /
Optional		 Type
string1 The string to search in. Required String
string2 The substring to search for. Required String
nstart The position where string to start searching. Optional Integer
nlength The length of the string to be searched for. Optional Integer

Return value:

Returns a number.

Value Type: Integer.

Pictorial Presentation

string_substr_count

Example: 

<?php
$string1="Welcome to w3resource.com";
echo substr_count($string1,'co'); 
echo substr_count($string1,'co',4); 
echo substr_count($string1,'co',4,4); 
?>

Output: 

2
1
0

View the example in the browser

See also

PHP Function Reference

Previous: substr_compare
Next: substr_replace



PHP: Tips of the Day

In PHP, there are two versions of logical AND and OR operators.

Operator True if
$a and $b Both $a and $b are true
$a && $b Both $a and $b are true
$a or $b Either $a or $b is true
$a || $b Either $a or $b is true

Note that the && and || opererators have higher precedence than and and or. See table below:

Evaluation Result of $e Evaluated as
$e = false || true True $e = (false || true)
$e = false or true False ($e = false) or true

Because of this it's safer to use && and || instead of and and or.