PHP SPL标准库之SplFixedArray使用实例_PHP教程

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ini_set('memory_limit','12800M');

for($size = 10000; $size

echo PHP_EOL . "Testing size: $size" . PHP_EOL;

for($s = microtime(true), $container = Array(), $i = 0; $i

echo "Array(): " . (microtime(true) - $s) . PHP_EOL;

for($s = microtime(true), $container = new SplFixedArray($size), $i = 0; $i

echo "SplArray(): " . (microtime(true) - $s) . PHP_EOL;

}

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Testing size: 10000

Array(): 0.004000186920166

SplArray(): 0.0019998550415039

Testing size: 40000

Array(): 0.017001152038574

SplArray(): 0.0090007781982422

Testing size: 160000

Array(): 0.050002098083496

SplArray(): 0.046003103256226

Testing size: 640000

Array(): 0.19701099395752

SplArray(): 0.16700983047485

Testing size: 2560000

Array(): 0.75704312324524

SplArray(): 0.67303895950317

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SplFixedArray implements Iterator , ArrayAccess , Countable {

/* 方法 */

public __construct ([ int $size = 0 ] )

public int count ( void )

public mixed current ( void )

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

public int getSize ( void )

public int key ( void )

public void next ( void )

public bool offsetExists ( int $index )

public mixed offsetGet ( int $index )

public void offsetSet ( int $index , mixed $newval )

public void offsetUnset ( int $index )

public void rewind ( void )

public int setSize ( int $size )

public array toArray ( void )

public bool valid ( void )

public void __wakeup ( void )

}

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$arr = new SplFixedArray(4);

$arr[0] = 'php';

$arr[1] = 1;

$arr[3] = 'python';

//遍历， $arr[2] 为null

foreach($arr as $v) {

echo $v . PHP_EOL;

}

//获取数组长度

echo $arr->getSize(); //4

//增加数组长度

$arr->setSize(5);

$arr[4] = 'new one';

//捕获异常

try{

echo $arr[10];

} catch (RuntimeException $e) {

echo $e->getMessage();

}