3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [ '$' => 'foo', '$a' => 'bar' ]; var_dump( $a["$"], $a["$a"], $a['$a'] );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: Array to string conversion in /in/A9BeM on line 10 Warning: Undefined array key "Array" in /in/A9BeM on line 10 string(3) "foo" NULL string(3) "bar"
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: Array to string conversion in /in/A9BeM on line 10 Warning: Undefined array key "Array" in /in/A9BeM on line 10 string(3) "foo" NULL string(3) "bar"
Output for 5.6.0 - 5.6.29, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Array to string conversion in /in/A9BeM on line 10 Notice: Undefined index: Array in /in/A9BeM on line 10 string(3) "foo" NULL string(3) "bar"
Output for 7.3.32 - 7.3.33
string(3) "foo" NULL string(3) "bar"
preferences:
137.54 ms | 401 KiB | 207 Q