3v4l.org

run code in 300+ PHP versions simultaneously
<?php $buffer = -1; function callback($output) { global $buffer; $buffer = $output; return $output.'r'; } ob_start('callback'); echo 'hello'; print_r(ob_get_status()); $a = ob_get_contents(); ob_get_clean(); echo $a; var_dump($buffer);
Output for 5.4.10 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
helloArray ( [name] => callback [type] => 1 [flags] => 113 [level] => 0 [chunk_size] => 0 [buffer_size] => 16384 [buffer_used] => 5 ) string(162) "helloArray ( [name] => callback [type] => 1 [flags] => 113 [level] => 0 [chunk_size] => 0 [buffer_size] => 16384 [buffer_used] => 5 ) "
Output for 5.4.0 - 5.4.9
helloArray ( [name] => callback [type] => 1 [flags] => 113 [level] => 0 [chunk_size] => 0 [buffer_size] => 16384 [buffer_used] => 5 ) string(0) ""
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
helloArray ( [level] => 1 [type] => 1 [status] => 0 [name] => callback [del] => 1 ) string(104) "helloArray ( [level] => 1 [type] => 1 [status] => 0 [name] => callback [del] => 1 ) "
preferences:
263.08 ms | 403 KiB | 354 Q