How to find how many times a string appears in php

Search method: 1. Use substr_count(), syntax "substr_count(string,substring)"; 2. Use mb_substr_count(), syntax "mb_substr_count(string,substring)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php search string How many times does it appear

Method 1: Use the substr_count() function

substr_count() function to count the number of times a substring appears in a string ( case-sensitive).

Syntax:

substr_count(string,substring,start,length)

• string Required. Specifies the string to be checked.

• #substring Required. Specifies the string to search for.​

• #start Optional. Specifies where in the string to begin the search.

• #length Optional. Specifies the length of the search.

Note: If the start parameter plus the length parameter is greater than the string length, this function generates a warning.

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$str="I love Shanghai. Shanghai is the biggest city in china.";
$count=substr_count($str,"Shanghai");
echo "Shanghai 出现了：".$count."次";
?>

Output result:

##Method 2: Use mb_substr_count() function

mb_substr_count() function counts the number of occurrences of a string.

Syntax:

mb_substr_count(string,substring,encoding)

• string Required. Specifies the string to be checked.

• #substring Required. Specifies the string to search for.

• encoding is optional. Specifies the character encoding. If omitted or null, the internal character encoding is used.

<?php
header("Content-type:text/html;charset=utf-8");
$str="我爱上海。上海是中国最大的城市。";
$count=mb_substr_count($str,"上海");
echo "上海 出现了：".$count."次";
?>

Output results:

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