- json_decode: documentation ( source)
- print_r: documentation ( source)
- str_replace: documentation ( source)
<?php
$str = '{"id":1,"channel":"1","text":"Hello World!"}{"id":2,"channel":"1","text":"Hello World!"}{"id":2,"channel":"1","text":"Hello World!"}';
$str = str_replace('}{', '},{', $str);
$str = '[' . $str . ']';
print_r(json_decode($str));