Fetching number from string in php

Question

$string = '763:74
74:274
177:474';

$number = array('763', '74', '177');

I need to get the corresponding values of $number from $string. Example: if number = 763 I need string value 74. If number = 74 I need string value 274 and so on.

What right now what I'm doing is exploding $string at : character, looping and matching.

Looking for some better solution.

Right now what i am doing is exploding $string at :, looping and matching. Show the code. I bet you're really close to the solution! — Rizier123
– Rizier123, Commented Nov 21, 2015 at 8:05
@Rizier123 Solution I have achieved but I want to avoid loop. It slows down the whole process if $string data increases. — Kunwarbir S.
– Kunwarbir S., Commented Nov 21, 2015 at 8:07
You can create an array, where the number before the colon is the key and the number after the colon the value. So then you can just do: echo $lookupArray[$yourNumber]; — Rizier123
– Rizier123, Commented Nov 21, 2015 at 8:09

Narendrasingh Sisodia · Accepted Answer · 2015-11-21 08:45:43Z

2

You can simply convert your string into an array simply using preg_replace_callback like as

$string = '763:74
74:274
177:474';

$result = [];
preg_replace_callback('/(\d+):(\d+)/m',function($m)use(&$result){
    $result[$m[1]] = $m[2];
},$string);

print_r($result);

output:

Array
(
    [763] => 74
    [74] => 274
    [177] => 474
)

Demo

answered Nov 21, 2015 at 8:45

Narendrasingh Sisodia

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Comments

Rizier123 · Accepted Answer · 2015-11-21 08:35:32Z

This should work for you:

First I split the string with preg_split() and use a new line as delimiter (\n), where I also consume all spaces (\s*) on the right and left side, so you don't have them in the key:

preg_split("/\s*\n\s*/", $string)

Then I go through each pair of numbers (x:y) with array_map() and explode() it by a colon. So you end up with an array like this:

Array
(
    [0] => Array
        (
            [0] => 763
            [1] => 74
        )

    [1] => Array
        (
            [0] => 74
            [1] => 274
        )

    [2] => Array
        (
            [0] => 177
            [1] => 474
        )

)

At the end I use array_column() to say, that you want to use the 0st column as key and the 1st column as value.

Code:

<?php

    $string = '763:74
    74:274
    177:474';

    $result = array_column(
        array_map(function($v){
            return explode(":", $v);
        }, preg_split("/\s*\n\s*/", $string)
    ), 1, 0);

    print_r($result);

?>

output:

Array
(
    [763] => 74
    [74] => 274
    [177] => 474
)

n-dru · Accepted Answer · 2015-11-21 08:43:18Z

1

You can do it using preg_match - first you find the position of the key string, then you find the pair with that key to know the length of the pair.:

function find_in_string($n,$string){
    preg_match("/(^|\s+)($n)(?=:)/",$string,$m1,PREG_OFFSET_CAPTURE);
    preg_match("/(^|\s+)($n\:\d+)/",$string,$m2);
    return substr($string,$m1[2][1]+ strlen($n)+1,strlen($m2[2])-strlen($n));
}

Example:

$string = '763:74
74:274
177:474';
foreach(array('763', '74', '177') as $n){
    echo find_in_string($n,$string);
}

Output:

74
274
474

Demo:

http://sandbox.onlinephpfunctions.com/code/320e8ba1b47e62b75459aaf70f07994fe531b101

answered Nov 21, 2015 at 8:43

n-dru

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