-
-
Save Hadryan/ffd6eef5451dc35d0c8de227e49c7524 to your computer and use it in GitHub Desktop.
PHP customized array_column function for recursion, named array_column_recursive
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
if ( ! function_exists( 'array_column_recursive' ) ) { | |
/** | |
* Returns the values recursively from columns of the input array, identified by | |
* the $columnKey. | |
* | |
* Optionally, you may provide an $indexKey to index the values in the returned | |
* array by the values from the $indexKey column in the input array. | |
* | |
* @param array $input A multi-dimensional array (record set) from which to pull | |
* a column of values. | |
* @param mixed $columnKey The column of values to return. This value may be the | |
* integer key of the column you wish to retrieve, or it | |
* may be the string key name for an associative array. | |
* @param mixed $indexKey (Optional.) The column to use as the index/keys for | |
* the returned array. This value may be the integer key | |
* of the column, or it may be the string key name. | |
* | |
* @return array | |
*/ | |
function array_column_recursive( $input = NULL, $columnKey = NULL, $indexKey = NULL ) { | |
// Using func_get_args() in order to check for proper number of | |
// parameters and trigger errors exactly as the built-in array_column() | |
// does in PHP 5.5. | |
$argc = func_num_args(); | |
$params = func_get_args(); | |
if ( $argc < 2 ) { | |
trigger_error( "array_column_recursive() expects at least 2 parameters, {$argc} given", E_USER_WARNING ); | |
return NULL; | |
} | |
if ( ! is_array( $params[ 0 ] ) ) { | |
// Because we call back to this function, check if call was made by self to | |
// prevent debug/error output for recursiveness :) | |
$callers = debug_backtrace(); | |
if ( $callers[ 1 ][ 'function' ] != 'array_column_recursive' ){ | |
trigger_error( 'array_column_recursive() expects parameter 1 to be array, ' . gettype( $params[ 0 ] ) . ' given', E_USER_WARNING ); | |
} | |
return NULL; | |
} | |
if ( ! is_int( $params[ 1 ] ) | |
&& ! is_float( $params[ 1 ] ) | |
&& ! is_string( $params[ 1 ] ) | |
&& $params[ 1 ] !== NULL | |
&& ! ( is_object( $params[ 1 ] ) && method_exists( $params[ 1 ], '__toString' ) ) | |
) { | |
trigger_error( 'array_column_recursive(): The column key should be either a string or an integer', E_USER_WARNING ); | |
return FALSE; | |
} | |
if ( isset( $params[ 2 ] ) | |
&& ! is_int( $params[ 2 ] ) | |
&& ! is_float( $params[ 2 ] ) | |
&& ! is_string( $params[ 2 ] ) | |
&& ! ( is_object( $params[ 2 ] ) && method_exists( $params[ 2 ], '__toString' ) ) | |
) { | |
trigger_error( 'array_column_recursive(): The index key should be either a string or an integer', E_USER_WARNING ); | |
return FALSE; | |
} | |
$paramsInput = $params[ 0 ]; | |
$paramsColumnKey = ( $params[ 1 ] !== NULL ) ? (string) $params[ 1 ] : NULL; | |
$paramsIndexKey = NULL; | |
if ( isset( $params[ 2 ] ) ) { | |
if ( is_float( $params[ 2 ] ) || is_int( $params[ 2 ] ) ) { | |
$paramsIndexKey = (int) $params[ 2 ]; | |
} else { | |
$paramsIndexKey = (string) $params[ 2 ]; | |
} | |
} | |
$resultArray = array(); | |
foreach ( $paramsInput as $row ) { | |
$key = $value = NULL; | |
$keySet = $valueSet = FALSE; | |
if ( $paramsIndexKey !== NULL && array_key_exists( $paramsIndexKey, $row ) ) { | |
$keySet = TRUE; | |
$key = (string) $row[ $paramsIndexKey ]; | |
} | |
if ( $paramsColumnKey === NULL ) { | |
$valueSet = TRUE; | |
$value = $row; | |
} elseif ( is_array( $row ) && array_key_exists( $paramsColumnKey, $row ) ) { | |
$valueSet = TRUE; | |
$value = $row[ $paramsColumnKey ]; | |
} | |
$possibleValue = array_column_recursive( $row, $paramsColumnKey, $paramsIndexKey ); | |
if ( $possibleValue ) { | |
$resultArray = array_merge( $possibleValue, $resultArray ); | |
} | |
if ( $valueSet ) { | |
if ( $keySet ) { | |
$resultArray[ $key ] = $value; | |
} else { | |
$resultArray[ ] = $value; | |
} | |
} | |
} | |
return $resultArray; | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment