How to count the occurrences of substrings in PHP

PHP method to count the number of occurrences of substrings: first create an HTML sample file; then define 3 string variables; finally use the PHP built-in function substr_count() to find and count the number of occurrences of substrings That’s it.

#The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer.

In PHP, you can use the built-in function substr_count() to find and count the number of occurrences of substrings. This article will introduce you to the substr_count() function and how to use it. .

PHP substr_count() function

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

Basic syntax:

substr_count($str1,$str2,$start,$length);

$str1 Parameter: Indicates the specified string, required parameter.

$str2 parameter: Indicates the substring to be found, required parameter.

$start parameter: Optional parameter, indicating the position in the string to start searching for statistics.

$length parameter: optional parameter, indicating the length of the search.

Note: Substrings are case-sensitive.

Simple example:

[Related video tutorial recommendations: PHP tutorial]

Pass below Simple code example to introduce the use of substr_count() function

Example 1:

<?php 
$s1 = "PHP中文网-PHP，php，javascript，PHP"; 
$s2 = "PHP"; 
$s3 = "php"; 
$res1 = substr_count($s1, $s2); 
$res2 = substr_count($s1, $s3); 
echo("PHP出现的次数：".$res1); 
echo("<br>"); 
echo("php出现的次数：".$res2); 
?>

Output:

Example 2: If the start and length parameters exceed the string length, the function will output a warning:

<?php 
header("content-type:text/html;charset=utf-8");
$s1 = "PHP中文网-PHP，php，javascript，PHP"; 
$s2 = "PHP"; 

$res = substr_count($s1, $s2,30,10); 
echo("PHP出现的次数：".$res); 
?>

Output:

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