基本

elseif

if ($a > $b) {
    echo "a is bigger than b";
} elseif ($a == $b) {
    echo "a is equal to b";
} else {
    echo "a is smaller than b";
}

switch

if ($i == 0) {
    echo "i equals 0";
} elseif ($i == 1) {
    echo "i equals 1";
} elseif ($i == 2) {
    echo "i equals 2";
}

switch ($i) {
    case 0:
        echo "i equals 0";
        break;
    case 1:
        echo "i equals 1";
        break;
    case 2:
        echo "i equals 2";
        break;
}

match

$food = 'cake';

$return_value = match ($food) {
    'apple' => 'This food is an apple',
    'bar' => 'This food is a bar',
    'cake' => 'This food is a cake',
};

var_dump($return_value);

结果

string(19) "This food is a cake"

循环

while

$i = 1;
while ($i <= 10) {
    echo $i++;  /* 在自增前（后自增）打印的值将会是 $i */
}

do-while

$i = 0;
do {
   echo $i;
} while ($i > 0);

for

/* 示例 1 */

for ($i = 1; $i <= 10; $i++) {
    echo $i;
}

/* 示例 2 */

for ($i = 1; ; $i++) {
    if ($i > 10) {
        break;
    }
    echo $i;
}

/* 示例 3 */

$i = 1;
for (;;) {
    if ($i > 10) {
        break;
    }
    echo $i;
    $i++;
}

/* 示例 4 */

for ($i = 1, $j = 0; $i <= 10; $j += $i, print $i, $i++);

foreach

$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
    $value = $value * 2;
}