String Functions
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PHP similar_text() Function

Topic: PHP String ReferencePrev|Next

Description

The similar_text() function calculates the similarity between two strings.

The following table summarizes the technical details of this function.

Return Value: Returns the number of matching characters in both strings.
Version: PHP 4+

Syntax

The basic syntax of the similar_text() function is given with:

similar_text(string1, string2, percent);

The following example shows the similar_text() function in action.

<?php
// Sample strings
$str1 = "Hello, John";
$str2 = "Hello, Alexander";

// Calculating similarity and print
echo similar_text($str1, $str2);
?>

Parameters

The similar_text() function accepts the following parameters.

Parameter Description
string1 Required. Specifies the first string to be compared.
string2 Required. Specifies the second string to be compared.
percent Optional. Specifies a variable to store the similarity in percent.

More Examples

Here're some more examples showing how similar_text() function actually works:

The following example shows how to calculate the similarity between two strings in percent.

<?php
// Sample strings
$str1 = "Hello, John";
$str2 = "Hello, Alexander";

// Calculating similarity and print
similar_text($str1, $str2, $percent);
echo $percent;
?>
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