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run code in 150+ php & hhvm versions
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<?php $records = array( array( 'id' => 2135, 'extra' => array( 'jelou' => 'hi', 'first_name' => 'Albert' ), ), array( 'id' => 2145, 'extra' => array( 'jelou' => 'hio', 'first_name' => 'Alberto' ), ), array( 'id' => 2155, 'extra' => array( 'jelou' => 'hia', 'first_name' => 'Alberta' ), ) ); print_r($records); $first_names = array_column($records, 'jelou'); print_r($first_names);
based on 5eOqd
Output for 5.5.24 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [id] => 2135 [extra] => Array ( [jelou] => hi [first_name] => Albert ) ) [1] => Array ( [id] => 2145 [extra] => Array ( [jelou] => hio [first_name] => Alberto ) ) [2] => Array ( [id] => 2155 [extra] => Array ( [jelou] => hia [first_name] => Alberta ) ) ) Array ( )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.4.45
Array ( [0] => Array ( [id] => 2135 [extra] => Array ( [jelou] => hi [first_name] => Albert ) ) [1] => Array ( [id] => 2145 [extra] => Array ( [jelou] => hio [first_name] => Alberto ) ) [2] => Array ( [id] => 2155 [extra] => Array ( [jelou] => hia [first_name] => Alberta ) ) ) Fatal error: Call to undefined function array_column() in /in/KSTJD on line 27
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Array ( [0] => Array ( [id] => 2135 [extra] => Array ( [jelou] => hi [first_name] => Albert ) ) [1] => Array ( [id] => 2145 [extra] => Array ( [jelou] => hio [first_name] => Alberto ) ) [2] => Array ( [id] => 2155 [extra] => Array ( [jelou] => hia [first_name] => Alberta ) ) ) Fatal error: Call to undefined function: array_column() in /in/KSTJD on line 27
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Array ( [0] => Array ( [id] => 2135 [extra] => Array ( [jelou] => hi [first_name] => Albert ) ) [1] => Array ( [id] => 2145 [extra] => Array ( [jelou] => hio [first_name] => Alberto ) ) [2] => Array ( [id] => 2155 [extra] => Array ( [jelou] => hia [first_name] => Alberta ) ) ) Fatal error: Call to undefined function: array_column() in /in/KSTJD on line 27
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Array ( [0] => Array ( [id] => 2135 [extra] => Array ( [jelou] => hi [first_name] => Albert ) ) [1] => Array ( [id] => 2145 [extra] => Array ( [jelou] => hio [first_name] => Alberto ) ) [2] => Array ( [id] => 2155 [extra] => Array ( [jelou] => hia [first_name] => Alberta ) ) ) Fatal error: Call to undefined function: array_column() in /in/KSTJD on line 27