Filter numbers from string php

1. Use preg_match_all[] Function to Extract Numbers From a String in PHP
2. Use filter_var[] Function to Extract Numbers From a String in PHP
3. Use preg_replace[] Function to Extract Numbers From a String in PHP

In this article, we will introduce methods to extract numbers from a string in PHP.

• Using preg_match_all[] function
• Using filter_variable[] function
• Using preg_replace[] function

We can use the built-in function preg_match_all[] to extract numbers from a string. This function globally searches a specified pattern from a string. The correct syntax to use this function is as follows:

preg_match_all[$pattern, $inputString, $matches, $flag, $offset];

The built-in function preg_match_all[] has five parameters. The details of its parameters are as follows

This function returns a Boolean variable. It returns true if the given pattern exists.

The program below shows how we can use the preg_match_all[] function to extract numbers from a given string.

We have used !\d+! pattern to extract numbers from the string.

Output:

Array
[
    [0] => Array
        [
            [0] => 4
            [1] => 6
        ]

]

We can also use the filter_var[] function to extract numbers from a string. The correct syntax to use this function is as follows:

filter_var[$variableName, $filterName, $options]

The function filter_var[] accepts three parameters. The detail of its parameters is as follows

We have used FILTER_SANITIZE_NUMBER_INT filter. The program that extracts numbers from the string is as follows:

Output:

The extracted numbers are: 46 

In PHP, we can also use the preg_replace[] function to extract numbers from a string. The correct syntax to use this function is as follows:

preg_replace[$regexPattern, $replacementVar, $original, $limit, $count]

The function preg_replace[] accepts five parameters. The detail of its parameters is as follows

We will use the pattern /[^0-9]/ for finding numbers in the string. The program that extracts numbers from the string is as follows:

Output:

The extracted numbers are: 46 

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