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兼容低版本PHP(5.5版本以下)的array_column()函数分享

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Release: 2016-06-20 13:01:17
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兼容低版本PHP(5.5版本以下)的array_column()函数

PHP 5.5新增array_column()数组函数,如果需要在低版本的PHP环境中使用,是不行的。本文介绍如何实现兼容低于PHP 5.5版本的array_column()函数..直接上代码。

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;
				}
			}
			$result[$key] = $tmp;
		}
		return $result;
	}
}
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