- var_dump: documentation ( source)
- preg_replace_callback: documentation ( source)
- print_r: documentation ( source)
- explode: documentation ( source)
- preg_replace: documentation ( source)
<?php
$str = "[[1500000000,2823.43,2848,2827.86,2847.68,526.4426911499979]]";
$arr = [];
preg_replace_callback('\[\]', function($m) use (&$arr){
$arr[] = explode(',',preg_replace('/([\w]+)/', "[$1]", $m[1]));
}, $str);
print_r($arr);
var_dump($arr);