Php get number in string

Php get number in string

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Extract Numbers From a String in 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

Use preg_match_all() Function to Extract Numbers From a String in PHP

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); 

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 .

php $string = 'Sarah has 4 dolls and 6 bunnies.'; preg_match_all('!\d+!', $string, $matches); print_r($matches); ?> 

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

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

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Extract Numbers From String in PHP

This approach isn’t efficient for certain use case, and simply returns the numbers present within the string together. For a more efficient, we can rely on regular expression.

Use preg_match_all() method

Use preg_match_all() method with /8+/ to extract numbers from String in PHP.

Here, output is array of matches, which can then be used to extract the numbers from the string.

We used the preg_match_all() function to search for the regular expression and extracted the numbers from the string.

We used regular expression in the form of a pattern /3+/ that matched the numbers in the string.

preg_match_all performs global regular expression match. It takes three arguments:
$pattern : The pattern to be searched
$subject : Input String
$matches :Array of all matches in the String.

Use preg_replace() method

We can achieve the same output as the filter_var method using regular expression where we replace all the characters that are not numbers with empty whitespace. The regular expression match value would be /[^0-9]/ .

Let’s illustrate this approach on the same string as in the previous section.

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PHP: Get numbers from a string.

This is a short PHP tutorial on how to get numbers from a string. To do this, we will extract the numbers using the function preg_match_all.

The preg_match_all function.

The preg_match_all function allows us to match certain characters using regular expressions. In our case, we want to match numerical values.

Getting integers / whole numbers from a string.

If you’re looking to extract whole numbers from a string, then you can use the following piece of code:

//A string containing two integer values. $str = 'There are 330 days until Christmas. It is currently 12PM.'; //Extract the numbers using the preg_match_all function. preg_match_all('!\d+!', $str, $matches); //Any matches will be in our $matches array var_dump($matches);

If you run the code above, you will get the following result:

Extracting numbers from a string in PHP.

As you can see, we were able to extract the integers from our string by using PHP’s preg_match_all function.

But what if we also want to be able to extract decimal numbers?

Extracting decimal numbers.

To extract decimal and float numbers from a string, we will have to use a different regular expression. Otherwise, our code in the previous example will split the numbers up.

//A string that contains both an integer and a decimal number. $string = 'A 2 euro coin weighs 8.5 grams.'; //Extract the numbers using the preg_match_all function. preg_match_all('!\d+\.*\d*!', $string, $matches); //var_dump the result var_dump($matches);

In the example above, we were able to extract both the whole number and the decimal number. If you var_dump the array, you will see the following result:

A var_dump of our $matches array.

As you can see, we managed to extract both the 2 and the 8.5 from our text.

Hopefully, you found the code above useful!

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