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php中文网手册 发布
(PHP 5 >= 5.3.0)
SplFixedArray::fromArray — Import a PHP array in a SplFixedArray instance
$array
[, bool $save_indexes = true
] )
Import the PHP array array
in a new SplFixedArray instance
array The array to import.
save_indexes Try to save the numeric indexes used in the original array.
Returns an instance of SplFixedArray containing the array content.
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)
}
[#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 !!!
?>