Originally Posted by
Jupos
A variable will run at exactly the same speed rather than putting the data in automatically.
See it yourself if you wont believe...
A constant use almost 2 times the memory of a variable...
PHP Code:
<?php
/* Define functions */
function timer_start() {
global $timestart;
$mtime = microtime();
$mtime = explode(' ',$mtime);
$mtime = $mtime[1] + $mtime[0];
$timestart = $mtime;
return true;
}
function timer_stop($display = 0, $precision = 3) {
global $timestart, $timeend;
$mtime = microtime();
$mtime = explode(' ',$mtime);
$mtime = $mtime[1] + $mtime[0];
$timeend = $mtime;
$timetotal = $timeend-$timestart;
if ($display)
echo number_format($timetotal,$precision);
return $timetotal;
}
function testvar($loop) {
global $val0,$val1,$val2,$val3,$val4,$val5,$val6,$val7,$val8;
for ($i=0;$i<$loop;$i++) {
$test = ((sin($val0 * $val1 + $val2))/$val6 * (sqrt( log($val3) * abs($val4 - 1/$val5)) / $val7)) * $val8;
}
}
function testarr($loop) {
global $arrayval;
for ($i=0;$i<$loop;$i++) {
$test = ((sin($arrayval[0] * $arrayval[1] + $arrayval[2]))/$arrayval[6] * (sqrt( log($arrayval[3]) * abs($arrayval[4] - 1/$arrayval[5])) / $arrayval[7])) * $arrayval[8];
}
}
function testconst($loop) {
for ($i=0;$i<$loop;$i++) {
$test = ((sin(VAL0 * VAL1 + VAL2))/VAL6 * (sqrt( log(VAL3) * abs(VAL4 - 1/VAL5)) / VAL7)) * VAL8;
}
}
/* Define variables, arrays and constants */
$loop = 10000;
$val0 = 11;
$val1 = 33.5;
$val2 = 0.333333333333;
$val3 = 4569988.2;
$val4 = 159;
$val5 = 2.33333333333;
$val6 = -10;
$val7 = -6.6;
$val8 = -1245487545;
define('VAL0',11);
define('VAL1',33.5);
define('VAL2',0.333333333333);
define('VAL3',4569988.2);
define('VAL4',159);
define('VAL5',2.33333333333);
define('VAL6',-10);
define('VAL7',-6.6);
define('VAL8',-1245487545);
$arrayval[0]=11;
$arrayval[1]=33.5;
$arrayval[2]=0.333333333333;
$arrayval[3]=4569988.2;
$arrayval[4]=159;
$arrayval[5]=2.33333333333;
$arrayval[6]=-10;
$arrayval[7]=-6.6;
$arrayval[8]=-1245487545;
/* Let's run a few tests now */
echo 'test with PHP '.phpversion();
echo "<hr>\n";
/**
* Straight Tests
*/
echo '<h1>lots of vars</h1>';
timer_start();
for($i=0;$i<$loop;$i++) {
$test = ((sin($val0 * $val1 + $val2))/$val6 * (sqrt( log($val3) * abs($val4 - 1/$val5)) / $val7)) * $val8;
}
echo 'straight, variables : ';timer_stop(1,9);
echo "<hr>\n";
timer_start();
for($i=0;$i<$loop;$i++) {
$test = ((sin($arrayval[0] * $arrayval[1] + $arrayval[2]))/$arrayval[6] * (sqrt( log($arrayval[3]) * abs($arrayval[4] - 1/$arrayval[5])) / $arrayval[7])) * $arrayval[8];
}
echo 'straight, array: ';timer_stop(1,9);
echo "<hr>\n";
timer_start();
for($i=0;$i<$loop;$i++) {
$test = ((sin(VAL0 * VAL1 + VAL2))/VAL6 * (sqrt( log(VAL3) * abs(VAL4 - 1/VAL5)) / VAL7)) * VAL8;
}
echo 'straight, constants: ';timer_stop(1,9);
echo "<hr>\n";
/**
* Function call and a global statement
*/
echo '<h1>function(lots of vars)</h1>';
timer_start();
testvar($loop);
echo 'function call, variables: ';timer_stop(1,9);
echo "<hr>\n";
timer_start();
testarr($loop);
echo 'function call, array: ';timer_stop(1,9);
echo "<hr>\n";
timer_start();
testconst($loop);
echo 'function call, constants: ';timer_stop(1,9);
echo "<hr>\n";
?>
