php循环匹配数组的值

<?php
$fruits = array("apple", "banana", "apple", "orange", "apple");

// 初始化一个空数组用于存放匹配的结果
$matchedFruits = [];

// 使用foreach循环遍历数组
foreach ($fruits as $fruit) {
    // 检查当前元素是否为"apple"
    if ($fruit == "apple") {
        // 如果是，将其添加到结果数组中
        $matchedFruits[] = $fruit;
    }
}

// 输出匹配的结果
print_r($matchedFruits);
?>

<?php
$fruits = array("apple", "banana", "apple", "orange", "apple");

// 使用引用遍历数组并修改值
foreach ($fruits as &$fruit) {
    if ($fruit == "apple") {
        $fruit = "grape";
    }
}

// 输出修改后的数组
print_r($fruits);
?>

<?php
$fruits = array("apple", null, "apple", "orange", "apple");

foreach ($fruits as $fruit) {
    if ($fruit !== null) {
        // 处理非空值
        echo $fruit . "\n";
    }
}
?>