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

";
$con=0;
for($i=0;$i

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

";
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)

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

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