PHP: similar_text() function


The similar_text() function is used to calculate the number of similar characters between two strings.
The similar_text() function can also calculate the similarity of the strings in percent.


(PHP 4 and above)


similar_text(first_string, second_string, npercent) 


Name Description Required /
first_string The first input string. Required String
second_string The second input string. Required String
npercent Variable to store the percentage of similarity between the input strings. Optional Integer

Return value:

Returns the number of matching chars in both strings.

Value Type: Integer


echo "Comparing strings : 'Good Morning' and 'Good Evening'".'<br>';
echo 'No of similar characters : '.similar_text('Good Morning', 'Good Evening').'<br>';
similar_text('Good Morning', 'Good Evening', $similar_percent);
echo 'Similarity between two strings in  percentage : '. $similar_percent;


Comparing strings: 'Good Morning' and 'Good Evening'
No of similar   characters : 9
Similarity between two strings in  percentage : 75

View the example in the browser

See also

PHP Function Reference

Previous: sha1
Next: sprintf

PHP: Tips of the Day

A resource is a special type of variable that references an external resource, such as a file, socket, stream, document, or connection


$file = fopen('/etc/passwd', 'r');
echo gettype($file);
# Out: resource
echo $file;
# Out: Resource id #2 

There are different (sub-)types of resource. You can check the resource type using get_resource_type():

$file = fopen('/etc/passwd', 'r'); 
echo get_resource_type($file);
#Out: stream
$sock = fsockopen('www.google.com', 80);
echo get_resource_type($sock);
#Out: stream