SplFixedArray::fromArray()
(PHP 5 >= 5.3.0, PHP 7)
Import a PHP array in a SplFixedArray instance
说明
public static SplFixedArray::fromArray(array $array[,bool $save_indexes=TRUE
] ): SplFixedArray
Import the PHP array $array in a new SplFixedArrayinstance
参数
- $array
The array to import.
- $save_indexes
Try to save the numeric indexes used in the original array.
返回值
Returns an instance of SplFixedArray containing the array content.
范例
SplFixedArray::fromArray() example
<?php $fa = SplFixedArray::fromArray(array(1 => 1, 0 => 2, 3 => 3)); var_dump($fa); $fa = SplFixedArray::fromArray(array(1 => 1, 0 => 2, 3 => 3), false); var_dump($fa); ?>
以上例程会输出:
object(SplFixedArray)#1 (4) { [0]=> int(2) [1]=> int(1) [2]=> NULL [3]=> int(3) } object(SplFixedArray)#2 (3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }
Memory footprint tests : <?php echo memory_get_usage()."\n"; // display 627760 $array = array_fill( 0, 2048, 'a' ); echo memory_get_usage()."\n"; // 824744, so 196984 for $array unset( $array ); echo memory_get_usage()."\n"; // 627792 $spl=SplFixedArray::fromArray( array_fill( 0, 2048, 'a' ) ); echo memory_get_usage()."\n"; //644944, so just 17151 for $spl !!! ?>