SplFixedArray::fromArray

(PHP 5 >= 5.3.0)

SplFixedArray::fromArray — Import a PHP array in a SplFixedArray instance

说明

public static SplFixedArray SplFixedArray::fromArray ( array $array [, bool $save_indexes = true ] )

Import the PHP array array in a new SplFixedArray instance

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

Example #1 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)
}

用户评论:

[#1] MuLoT [2010-12-10 09:15:23]

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 !!! ?>