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run code in 300+ PHP versions simultaneously
<?php $obj = new stdClass; $obj->{123} = '456'; print_r($obj); if (property_exists($obj,123)) echo 'Property 123 exists',"\n"; if (isset($obj->{123})) { echo "Property value: {$obj->{123}},"\n";}
Output for 5.4.0 - 5.4.34
Parse error: syntax error, unexpected '\' (T_NS_SEPARATOR), expecting ',' or ';' in /in/Z09QF on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_NS_SEPARATOR, expecting ',' or ';' in /in/Z09QF on line 7
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Z09QF on line 7 Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in /in/Z09QF on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 5.0.0 - 5.0.5
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Z09QF on line 7 Parse error: parse error, unexpected T_STRING, expecting ',' or ';' in /in/Z09QF on line 7
Process exited with code 255.
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Property name must be a string in /in/Z09QF on line 3
Process exited with code 255.
Output for 4.3.2
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Z09QF on line 7 Parse error: parse error, expecting `','' or `';'' in /in/Z09QF on line 7
Process exited with code 255.

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