3v4l.org

run code in 300+ PHP versions simultaneously
<?php function test($a) { fwrite($a, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'); fseek($a, 0); fwrite($a, '1234567890'); fseek($a, 0); var_dump(fread($a, 1024)); fclose($a); } $a = fopen('php://temp', 'a+'); test($a); echo '-------------------' . PHP_EOL; $a = fopen(tempnam(sys_get_temp_dir(), 'hello'), 'a+'); test($a);
preferences:
70.67 ms | 411 KiB | 5 Q