PHP Custom Array function Array_column

if (!function_exists (' Array_column ')) { function Array_column ($input, $columnKey, $indexKey =null) { $columnKeyIsNumber = (Is_numeric ($columnKey))? True:false; $indexKeyIsNull = (Is_null ($indexKey))? True:false; $indexKeyIsNumber = (Is_numeric ($indexKey))? True:false; $result = Array (); foreach ((array) $input as $key = + $row) { if ($columnKeyIsNumber) { $tmp = Array_slice ($row, $columnKey, 1); $tmp = (Is_array ($tmp) &&!empty ($tmp))? Current ($TMP): null; }else{ $tmp = Isset ($row [$columnKey])? $row [$columnKey]: null; } if (! $indexKeyIsNull) { if ($indexKeyIsNumber) { $key = Array_slice ($row, $indexKey, 1); $key = (Is_array ($key) &&!empty ($key))? Current ($key): null; $key = Is_null ($key)? 0: $key; }else{ $key = Isset ($row [$indexKey])? $row [$indexKey]: 0; } }//Bbs.it-home.org $result [$key] = $tmp; } return $result; } } Examples of Use $records = Array ( Array ' id ' = 2135, ' first_name ' = ' John ', ' last_name ' = ' Doe ' ), Array ' id ' = 3245, ' first_name ' = ' Sally ', ' last_name ' = ' Smith ' ), Array ' id ' = 5342, ' first_name ' = ' Jane ', ' last_name ' = ' Jones ' ), Array ' id ' = 5623, ' first_name ' = ' Peter ', ' last_name ' = ' Doe ' ) ); $firstNames = Array_column ($records, ' first_name '); Print_r ($firstNames); /* Array ( [0] = John [1] = Sally [2] = Jane [3] = Peter ) */ $records = Array ( Array (1, ' John ', ' Doe '), Array (2, ' Sally ', ' Smith '), Array (3, ' Jane ', ' Jones ') ); $lastNames = Array_column ($records, 2); Print_r ($lastNames); /* Array ( [0] = = Doe [1] = Smith [2] = Jones ) */ $mismatchedColumns = Array ( Array ' A ' = ' foo ', ' B ' = ' bar ', ' E ' = ' baz ' ), Array ' A ' = ' qux ', ' C ' = ' Quux ', ' d ' = ' corge ' ), Array ' A ' = ' grault ', ' B ' = ' garply ', ' E ' = ' Waldo ' ), ); $foo = Array_column ($mismatchedColumns, ' A ', ' B '); Print_r ($foo); /* Array ( [Bar] = foo [0] = Qux [Garply] = Grault ) */ Copy Code

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