How to calculate how many m characters there are in a string in php

Two calculation methods: 1. Use the for statement to loop through the characters in the string and count the number of m characters. The syntax "$con=0;for($i=0;$i

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php calculates strings How many m characters are there

Method 1: Use the for statement to loop through the characters in the string and count the number of m characters

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="34mvghm45m67m";
echo "原字符串：".$str."<br>";
$con=0;
for($i=0;$i<strlen($str);$i++){
	if($str[$i]==="m"){
		$con++;
	}
}
echo "m字符的个数：".$con;
?>

Method 2: Use the substr_count() function to count the number of m characters

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="m34mvghm45m67mm";
echo "原字符串：".$str."<br>";
echo "m字符的个数：".substr_count($str,"m");
?>

Instructions:

substr_count() function counts the number of times a substring appears in a string. (Substrings are case-sensitive.)

substr_count(string,substring,start,length)

Parameter	Description
string	Required. Specifies the string to check.
substring	Required. Specifies the string to be retrieved.
start	Optional. Specifies where in the string to begin the search.
length	Optional. Specifies the length of the search.

Return value: Returns the number of times the substring appears in the string.

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