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run code in 150+ php & hhvm versions
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<?php $obj = new stdClass; $obj->{'123'} = '456'; // defined property but unusable as obj->property; see below. print_r($obj); echo 'Via {\'123\'}: ' . $obj->{'123'},"\n"; if (isset($obj->{'123'})) { echo '123 is set',"\n";} if (property_exists($obj,'123')) echo 'property 123 exists',"\n"; echo $obj->{'123'}; // Parse error: ...unexpected '123' (T_LNUMBER), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' $obj->{'a123'} = $obj->{'123'}; print_r($obj); echo 'Via Property a123: ' . $obj->a123,"\n"; // making a hash out of property a $obj->a["123"] = $obj->{'123'}; $obj->a["a123"] = $obj->{'a123'}; var_dump($obj); echo 'Via Property "a" and hashkey "123": ' . $obj->a["123"],"\n"; // contrast: $obj = (object)array((string)'123' => '456'); // property 123 is invalid print_r($obj); echo $obj->{'123'},"\n"; // so "Undefined property: stdClass::$123"
based on J79va
Output for 5.2.6 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
stdClass Object ( [123] => 456 ) Via {'123'}: 456 123 is set property 123 exists 456stdClass Object ( [123] => 456 [a123] => 456 ) Via Property a123: 456 object(stdClass)#1 (3) { ["123"]=> string(3) "456" ["a123"]=> string(3) "456" ["a"]=> array(2) { [123]=> string(3) "456" ["a123"]=> string(3) "456" } } Via Property "a" and hashkey "123": 456 stdClass Object ( [123] => 456 ) Notice: Undefined property: stdClass::$123 in /in/ncPAP on line 23
Output for 5.1.1 - 5.2.5
stdClass Object ( [123] => 456 ) Via {'123'}: 456 123 is set property 123 exists 456stdClass Object ( [123] => 456 [a123] => 456 ) Via Property a123: 456 object(stdClass)#1 (3) { ["123"]=> string(3) "456" ["a123"]=> string(3) "456" ["a"]=> array(2) { [123]=> string(3) "456" ["a123"]=> string(3) "456" } } Via Property "a" and hashkey "123": 456 stdClass Object ( [123] => 456 ) Notice: Undefined property: stdClass::$123 in /in/ncPAP on line 23
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/ncPAP on line 23
Process exited with code 255.
Output for 5.0.0 - 5.0.5
stdClass Object ( [123] => 456 ) Via {'123'}: 456 123 is set Fatal error: Call to undefined function property_exists() in /in/ncPAP on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
stdClass Object ( [123] => 456 ) Via {'123'}: 456 123 is set Fatal error: Call to undefined function: property_exists() in /in/ncPAP on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
stdClass Object ( [123] => 456 ) Via {'123'}: 456 123 is set Fatal error: Call to undefined function: property_exists() in /in/ncPAP on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
stdClass Object ( [123] => 456 ) Via {'123'}: 456 123 is set Fatal error: Call to undefined function: property_exists() in /in/ncPAP on line 7