Paste 2013-02-06 22:31

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<?php

/**
 * @licence GNU GPL v2+
 * @author Jeroen De Dauw < jeroendedauw@gmail.com >
 * @author Tim Starling
 */

//error_reporting(E_ALL| E_STRICT);
//ini_set("display_errors", 1);

function a1() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = count( $array ) == 0;
	}
}

function b1() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = $array === array();
	}
}

function c1() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = empty( $array );
	}
}

function d1() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = !$array;
	}
}


function a5() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = count( $array ) == 0;
	}
}

function b5() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = $array === array();
	}
}

function c5() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = empty( $array );
	}
}

function d5() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = !$array;
	}
}


function a100() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = count( $array ) == 0;
	}
}

function b100() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = $array === array();
	}
}

function c100() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = empty( $array );
	}
}

function d100() {
	global $array;
	for ( $i = 0; $i < 10000000; $i++ ) {
		$a = !$array;
	}
}

xhprof_enable( XHPROF_FLAGS_NO_BUILTINS );

$size = 1;



$array = array_fill( 0, $size, 0 );

$array = array_map( function() { return mt_rand(); }, $array );
//$hash = array_fill_keys( $array, true );




// profile( 'findArray' );
// 
// profile( 'findHash' );


a1();
b1();
c1();
d1();

$size = 5;




$array = array_fill( 0, $size, 0 );

$array = array_map( function() { return mt_rand(); }, $array );
//$hash = array_fill_keys( $array, true );




// profile( 'findArray' );
// 
// profile( 'findHash' );


a5();
b5();
c5();
d5();



$size = 100;


$array = array_fill( 0, $size, 0 );

$array = array_map( function() { return mt_rand(); }, $array );
//$hash = array_fill_keys( $array, true );




// profile( 'findArray' );
// 
// profile( 'findHash' );


a100();
b100();
c100();
d100();

$data = xhprof_disable();

foreach ( array( 1, 5, 100 ) as $size ) {
	echo "SIZE $size:\n";

	$a = $data["main()==>a$size"]['wt'];
	$b = $data["main()==>b$size"]['wt'];
	$c = $data["main()==>c$size"]['wt'];
	$d = $data["main()==>d$size"]['wt'];

	printf( "a: %.3f ns\n", $a / 1000000 * 1000 );
	printf( "b: %.3f ns\n", $b / 1000000 * 1000 );
	printf( "c: %.3f ns\n", $c / 1000000 * 1000 );
	printf( "d: %.3f ns\n", $d / 1000000 * 1000 );
}


/*

SIZE 1:
a: 3375.365 ns
b: 1282.860 ns
c: 701.357 ns
d: 703.902 ns
SIZE 5:
a: 4897.867 ns
b: 1297.596 ns
c: 702.082 ns
d: 701.680 ns
SIZE 100:
a: 40561.674 ns
b: 1282.999 ns
c: 713.409 ns
d: 703.935 ns

*/

?>