$arrayCount = 2000;
$cycleCount = 100000;
echo "向函数传递参数并做修改", PHP_EOL;
function ByVal($p){return $p[intval(count($p) / 2)] += 1;}
function ByRef(&$p){return $p[intval(count($p) / 2)] += 1;}
$p = array_fill(0, $arrayCount, 1);
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$a = ByVal($p);
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByValFun: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$a = ByRef($p);
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByRefFun: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL , PHP_EOL;
echo "向函数传递参数不做修改", PHP_EOL;
function ByVal2($p){return $p[intval(count($p) / 2)];}
function ByRef2(&$p){return $p[intval(count($p) / 2)];}
$p = array_fill(0, $arrayCount, 1);
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$a = ByVal2($p);
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByValFun: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$a = ByRef2($p);
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByRefFun: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL , PHP_EOL;
echo "变量赋值做修改", PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
$a = $p;
$a[2] += 1;
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByVal: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
$a = &$p;
$a[2] += 1;
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByRef: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL , PHP_EOL;
echo "变量赋值不做修改", PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
$a = $p;
$b = $a[2];
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByVal: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
$a = &$p;
$b = $a[2];
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByRef: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL , PHP_EOL;
echo "数组内循环赋值修改数据", PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
foreach($p as $key => $val){
$p[$key] += 1;
}
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByKey: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
foreach($p as &$val){
$val += 1;
}
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByRef: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL , PHP_EOL;
echo "数组内循环赋值不修改数据", PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
foreach($p as $key => $val){
$b = $val;
}
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByKey: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL;
$start = microtime(true);
$startMem = Memory_get_usage();
for($i = 0; $i < $cycleCount; $i += 1){
$p = array_fill(0, $arrayCount, 1);
foreach($p as &$val){
$b = $val;
}
}
$end = microtime(true);
$endMem = Memory_get_usage();
echo 'ByRef: ', $end - $start, 's' , PHP_EOL, 'Mem: ', $endMem - $startMem , PHP_EOL;