3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function flatten(array $nestedArraysAndStrings){ $flat=[]; $iter = new RecursiveIteratorIterator( new RecursiveArrayIterator($nestedArraysAndStrings)); foreach($iter as $leaf){ $flat[] = $leaf; } return join(NULL, $flat); } $noRefs = [[[['some']]],[' nested ']," items n"]; $withRefs = []+$noRefs; $wat = $noRefs[0]; $withRefs[0] = &$wat; echo flatten($noRefs); echo flatten($withRefs);
Output for 5.4.0 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.1.14 - 7.1.20, 7.2.2 - 7.2.8
some nested items nsome nested items n
Output for 7.0.0 - 7.1.13, 7.2.0 - 7.2.1
some nested items n Notice: Array to string conversion in /in/up3me on line 8 Array nested items n
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/up3me on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/up3me on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/up3me on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/up3me on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/up3me on line 3
Process exited with code 255.