How Do I Take Out Only Numbers From A PHP String?

Question

Suppose, I have this string:

$string = "Hello! 123 How Are You? 456";

I want to set variable $int to $int = 123456;

How do I do it?

Example 2:

$string = "12,456";

Required:

$num = 12456;

Thank you!

possible duplicate of [Extract numbers from a string](http://stackoverflow.com/questions/6278296/extract-numbers-from-a-string) — Amal Murali, Mar 29 '14 at 07:25
It's *not* a duplicate of that question, which is about getting *all/any (groups of)* numbers. — user2864740, Mar 29 '14 at 07:25
Here is the solution-http://stackoverflow.com/questions/11243447/get-numbers-from-string-with-php — Mandeep Singh, Mar 29 '14 at 07:39

score 38 · Accepted Answer · edited Apr 25 '18 at 03:56

38

Correct variant will be:

$string = "Hello! 123 How Are You? 456";
$int = intval(preg_replace('/[^0-9]+/', '', $string), 10);

edited Apr 25 '18 at 03:56

AskNilesh

67,701
16
123
163

answered Mar 29 '14 at 07:31

Iłya Bursov

23,342
4
33
57

1

Now you check your code for string "hello 0123"... :) – Bangash Mar 29 '14 at 08:16
@ArifHussain yes, it works for 0123 and provides proper decimal 123, as expected – Iłya Bursov Mar 29 '14 at 19:03
@Lashane , so in that case Shankar's code is also correct, which you commented on. – Bangash Mar 30 '14 at 06:56
This code will malform large numbers, for example `abc12345678901234556782312312323123123131232` – Mike Doe Jul 03 '15 at 12:49
@mike php by nature cannot work with such big numbers, you need special library for this – Iłya Bursov Jul 04 '15 at 01:00

score 4 · Answer 2 · answered Mar 29 '14 at 07:27

4

You can use this method to select only digit present in your text

function returnDecimal($text) {
    $tmp = "";  
    for($text as $key => $val) {
      if($val >= 0 && $val <= 9){
         $tmp .= $val
      }
    }
    return $tmp;
}

answered Mar 29 '14 at 07:27

Fopa Léon Constantin

11,863
8
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Inefficient and slow. – Mike Doe Jul 03 '15 at 12:50

Shankar Narayana Damodaran · Answer 3 · 2014-03-29T07:31:47.333

2

Use this regular expression !\d!

<?php
$string = "Hello! 123 How Are You? 456";
preg_match_all('!\d!', $string, $matches);
echo (int)implode('',$matches[0]);

enter image description here

edited Mar 29 '14 at 07:31

answered Mar 29 '14 at 07:25

Shankar Narayana Damodaran

68,075
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A `0` before a number is not required. – Shankar Narayana Damodaran Mar 29 '14 at 07:32
Shankar, I think what Lashane is getting at is that (int) will cast that as octal if it's prefaced by a 0. Or am I completely off? – Helpful Mar 29 '14 at 07:33
1

@Helpful you're right, you cannot just use (int) to convert string to number in php – Iłya Bursov Mar 29 '14 at 07:34
1

@Lashane, You are not getting it, the regex grabs the numbers from the string , and casting it to `int` is not going to making it as octal. – Shankar Narayana Damodaran Mar 29 '14 at 08:23
1

@ShankarDamodaran yes, I've mistaken with javascript where you 0 prefixed numbers will be supposed as octal – Iłya Bursov Mar 29 '14 at 19:10

score 2 · Answer 4 · edited Nov 22 '15 at 20:57

2

You can use the below:

$array = [];

preg_match_all('/-?\d+(?:\.\d+)?+/', $string, $array);

Where $string is the entered string and $array is where each number(not digit!,including also negative values!) is loaded and available for different more operations.

edited Nov 22 '15 at 20:57

Bhargav Rao

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answered Nov 22 '15 at 20:49

Miroslav Gorchev

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score -1 · Answer 5 · answered Feb 18 '21 at 05:15

-1

<?php
    $string = "ABC100";
    preg_match_all('!\d+!', $string, $matches);
    $number = $matches[0][0];
    echo $number;
?>

Output: 100

answered Feb 18 '21 at 05:15

Sreejith N

25
5

1

This code-only answer provides no new value to this page or Stack Overflow. Please only answer when you have something unique and valuable to add to the page. Worse, it only displays the first of all matches. – mickmackusa Feb 18 '21 at 05:40

How Do I Take Out Only Numbers From A PHP String?

5 Answers5