使用php在一对2中分割逗号分隔的字符串

I have a string having 128 values in the form of :

1,4,5,6,0,0,1,0,0,5,6,...1,2,3.

I want to pair in the form of :

(1,4),(5,6),(7,8)

so that I can make a for loop for 64 data using PHP.

<?php
$a = 'val1,val2,val3,val4';

function x($value)
    {
        $buffer = explode(',', $value);
        $result = array();

        while(count($buffer))
            { $result[] = array(array_shift($buffer), array_shift($buffer)); }

        return $result;
    }

$result = x($a);

var_dump($result);
?>

Shows:

array(2) { [0]=> array(2) { [0]=> string(4) "val1" [1]=> string(4) "val2" } [1]=> array(2) { [0]=> string(4) "val3" [1]=> string(4) "val4" } }

If modify it, then it might help you this way:

<?php
$a = '1,2,3,4';

function x($value)
    {
        $buffer = explode(',', $value);
        $result = array();

        while(count($buffer))
            { $result[] = sprintf('(%d,%d)', array_shift($buffer), array_shift($buffer)); }

        return implode(',', $result);
    }

$result = x($a);

var_dump($result);
?>

Which shows:

string(11) "(1,2),(3,4)"

You can accomplish this in these steps:

1. Use explode() to turn the string into an array of numbers

2. Use array_chunk() to form groups of two

3. Use array_map() to turn each group into a string with brackets

4. Use join() to glue everything back together.

You can use this delicious one-liner, because everyone loves those:

echo join(',', array_map(function($chunk) {
    return sprintf('(%d,%d)', $chunk[0], isset($chunk[1]) ? $chunk[1] : '0');
}, array_chunk(explode(',', $array), 2)));

Demo

If the last chunk is smaller than two items, it will use '0' as the second value.