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PHP substr_count() Function Usage and Example

The substr_count() function is used to count the number of times a substring appears in a string.

Syntax

substr_count(string,substring,start,length)

Definition and Usage

substr_count() returns the number of times the substring substring appears in the string string. Note that substring is case-sensitive.

Return Value

The function returns an integer. It returns the number of times the substring appears in the string.

Parameter

Number	Parameters and Description
1	string Specify the string in which to search.
2	substring Used to specify the string to be searched
3	start It specifies when to start searching in the string, the offset position for counting. If it is negative, it starts counting from the end of the character.
4	length It specifies the length of the string

Online Example

Try the following example to count the number of occurrences of "krishna" in the string:

Example

<?php
　　　　//Count the number of occurrences of "krishna" in the string
　　　　echo substr_count("sairamkrishna","krishna");
　　　　echo '<br>';
　　　　$text = 'This is a test';
　　　　echo strlen($text);　//　14
　　　　echo '<br>';
　　　　echo substr_count($text, 'is');　//　2
　　　　echo '<br>';
　　　　//　The string is simplified to 's is a test', so the output is　1
　　　　echo substr_count($text, 'is',　3);
　　　　echo '<br>';
　　　　//　The string is simplified to 's i', so the output is 0
　　　　echo substr_count($text, 'is',　3,　3);
　　　　echo '<br>';
　　　　//　Output　1Because this function does not count overlapping strings
　　　　$text2　= 'gcdgcdgcd';
　　　　echo substr_count($text2, 'gcd');　　
　　　　echo '<br>';
　　　　//　Because　5+10　>　14Therefore, a warning is generated
　　　　echo substr_count($text, 'is',　5,　10);
?>

Test and see‹/›

Output Result

1
14
2
1
0
3
PHP Warning: Invalid length value in substr_count():...

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