PHP calculates the similarity function similar_text() between two strings

Example

Calculate the similarity of two strings and return the number of matching characters:

<?php
echo similar_text("Hello World","Hello Peter");
?>

Definition and usage

similar_text() function calculates two strings similarity.

This function can also calculate the percentage similarity of two strings.

Note: levenshtein() function is faster than similar_text() function. However, the similar_text() function provides more accurate results with fewer modifications required.

Syntax

similar_text(string1,string2,percent)

Parameter Description

string1 Required. Specifies the first string to compare. ​

string2 Required. Specifies the second string to be compared.

percent Optional. Specifies the variable name used to store percent similarity.

Technical details

Return value: Returns the number of matching characters in the two strings.

PHP version: 4+

More examples

Example 1

Calculate the percentage similarity of two strings:

<?php
similar_text("Hello World","Hello Peter",$percent);
echo $percent;
?>

PHP has a function similar_text() that calculates the similarity of two strings, and you can get a percentage to express the similarity of the two strings. The effect is as follows:

similar_text('aaaa', 'aaaa', $percent); 
var_dump($percent); 
//float(100) 
similar_text('aaaa', 'aaaabbbb', $percent); 
var_dump($percent); 
//float(66.666666666667) 
similar_text('abcdef', 'aabcdefg', $percent); 
var_dump($percent); 
//float(85.714285714286)

Using this function, you can use it to perform fuzzy search functions, or other functions that require fuzzy matching. Recently, I have involved this function in the feature matching step in the research on verification code recognition.

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