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PHP函数 "array_push" 将元素推入数组中

  • 2026-01-20 18:46:18
PHP函数 "array_push" 将元素推入数组中

在PHP开发中,数组操作是最常见的任务之一。array_push()函数作为PHP数组处理工具箱中的重要成员,为开发者提供了一种直观、高效的方式向数组中添加一个或多个元素。本文将深入探讨这个看似简单却功能强大的函数。

基础语法:理解array_push的工作原理

array_push()函数的基本语法非常简单:

array_push(array &$array, mixed ...$values): int

让我们分解这个语法:

  • 第一个参数 $array:目标数组(通过引用传递)
  • 后续参数 $values:要推入数组的一个或多个值
  • 返回值:操作后数组的新长度(元素数量)

基础用法:从简单到复杂

1. 单个元素推入
$fruits = ["apple""banana"];
$newLength = array_push($fruits, "orange");

print_r($fruits);
// 输出: Array ( [0] => apple [1] => banana [2] => orange )
echo"数组新长度: " . $newLength; // 输出: 3
2. 多个元素一次性推入
$numbers = [123];
$newLength = array_push($numbers, 456);

print_r($numbers);
// 输出: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )
echo"数组新长度: " . $newLength; // 输出: 6
3. 处理关联数组
$user = ["name" => "John""age" => 30];
$newLength = array_push($user, "extra1""extra2");

print_r($user);
// 输出: Array ( [name] => John [age] => 30 [0] => extra1 [1] => extra2 )
// 注意:推入的元素使用数字键,从0开始

与[]语法对比:何时选择array_push?

PHP提供了两种向数组添加元素的主要方式:array_push()和简写的[]语法。

性能对比
// 方法1: array_push (多个元素)
$start = microtime(true);
$array1 = [];
for ($i = 0; $i < 10000; $i++) {
    array_push($array1, $i, $i+1, $i+2);
}
$time1 = microtime(true) - $start;

// 方法2: [] 语法 (多个元素需多次调用)
$start = microtime(true);
$array2 = [];
for ($i = 0; $i < 10000; $i++) {
    $array2[] = $i;
    $array2[] = $i+1;
    $array2[] = $i+2;
}
$time2 = microtime(true) - $start;

// 方法3: array_push (单个元素)
$start = microtime(true);
$array3 = [];
for ($i = 0; $i < 10000; $i++) {
    array_push($array3, $i);
}
$time3 = microtime(true) - $start;

// 方法4: [] 语法 (单个元素)
$start = microtime(true);
$array4 = [];
for ($i = 0; $i < 10000; $i++) {
    $array4[] = $i;
}
$time4 = microtime(true) - $start;

echo"array_push多个元素: " . $time1 . "秒\n";
echo"[]语法多个元素: " . $time2 . "秒\n";
echo"array_push单个元素: " . $time3 . "秒\n";
echo"[]语法单个元素: " . $time4 . "秒\n";

性能结论:

  • 添加单个元素时,[]语法通常比array_push()稍快
  • 添加多个元素时,array_push()通常更高效,因为它是单个函数调用
可读性与用例选择
// 场景1: 添加单个元素 - 推荐使用 []
$userList = [];
$userList[] = "Alice";
$userList[] = "Bob";

// 场景2: 动态添加多个元素 - 推荐使用 array_push
$config = [];
$valuesToAdd = getDynamicValues(); // 返回多个值的函数
array_push($config, ...$valuesToAdd); // 使用扩展运算符

// 场景3: 需要获取新数组长度时
$stack = [];
$length = array_push($stack, "task1""task2""task3");
echo"待处理任务数: " . $length; // 直接使用返回值

高级技巧与实用模式

1. 使用扩展运算符处理动态参数
// 动态参数传递
functionaddToCollection($collection, ...$items){
return array_push($collection, ...$items);
}

$data = ["a""b"];
$newItems = ["c""d""e"];
$newLength = addToCollection($data, ...$newItems);

// 或者更简洁地
array_push($data, ...$newItems);
2. 实现栈数据结构
classSimpleStack{
private $items = [];

publicfunctionpush(...$elements){
return array_push($this->items, ...$elements);
    }

publicfunctionpop(){
return array_pop($this->items);
    }

publicfunctionpeek(){
return end($this->items);
    }

publicfunctionsize(){
return count($this->items);
    }
}

$stack = new SimpleStack();
$stack->push("document1""document2");
echo $stack->pop(); // 输出: document2
3. 批量数据处理管道
classDataProcessor{
private $pipeline = [];

publicfunctionaddStage(callable $stage){
        array_push($this->pipeline, $stage);
return$this// 支持链式调用
    }

publicfunctionprocess($data){
foreach ($this->pipeline as $stage) {
            $data = $stage($data);
        }
return $data;
    }
}

$processor = new DataProcessor();
$processor
    ->addStage(fn($x) => $x * 2)
    ->addStage(fn($x) => $x + 10)
    ->addStage(fn($x) => $x / 2);

$result = $processor->process(5); // 输出: 10
4. 与array_pop()配合实现队列
// 简单队列实现(效率不高,仅演示)
$queue = [];

// 入队 - 使用array_push
array_push($queue, "customer1""customer2""customer3");

// 处理队列
while (!empty($queue)) {
// 出队 - 使用array_shift(不是array_pop,因为队列是FIFO)
    $current = array_shift($queue);
echo"正在处理: " . $current . "\n";

// 模拟处理更多客户
if (rand(01) && count($queue) < 5) {
        array_push($queue, "new_customer_" . time());
    }
}

常见陷阱与最佳实践

陷阱1:意外覆盖关联数组键名
$config = [
"host" => "localhost",
"port" => 3306
];

array_push($config, "newValue");
// $config现在变为: ["host" => "localhost", "port" => 3306, 0 => "newValue"]
// 注意数字键0可能与其他数字键冲突

// 更好的做法(对于关联数组):
$config["option"] = "newValue";
陷阱2:性能敏感场景的误用
// 不推荐 - 在循环中使用array_push添加单个元素
$largeArray = [];
for ($i = 0; $i < 100000; $i++) {
    array_push($largeArray, $i); // 使用[]语法更快
}

// 推荐 - 批量添加时使用array_push
$largeArray = [];
$batch = range(11000);
for ($i = 0; $i < 100; $i++) {
    array_push($largeArray, ...$batch); // 一次性添加1000个元素
}
陷阱3:忽略返回值
$tasks = [];
array_push($tasks, "task1""task2");

// 需要知道数组大小时
$newSize = array_push($tasks, "task3""task4");
if ($newSize > 10) {
    trigger_error("任务队列过长", E_USER_WARNING);
}

替代方案与补充函数

1. array_unshift() - 在数组开头添加元素
$queue = ["task2""task3"];
array_unshift($queue, "task1"); // 添加在开头
// 结果: ["task1", "task2", "task3"]
2. 数组合并函数
// array_merge - 合并数组
$array1 = ["a""b"];
$array2 = ["c""d"];
$result = array_merge($array1, $array2);
// 结果: ["a", "b", "c", "d"]

// 使用+运算符(注意键名保留)
$assoc1 = ["a" => 1"b" => 2];
$assoc2 = ["b" => 3"c" => 4];
$result = $assoc1 + $assoc2; // $assoc1的键优先
// 结果: ["a" => 1, "b" => 2, "c" => 4]
3. 扩展赋值运算符(PHP 7.4+)
// PHP 7.4引入的数组扩展赋值运算符
$array = [];
$array[] = "first";
$array[] = "second";

// 相当于
$array = [];
array_push($array, "first""second");

实战应用案例

案例1:构建动态SQL查询
classQueryBuilder{
private $conditions = [];
private $params = [];

publicfunctionwhere($field, $operator, $value){
        $paramName = ":" . $field . count($this->params);
$this->conditions[] = "$field $operator $paramName";
        array_push($this->params, $value);
return$this;
    }

publicfunctionbuild(){
        $sql = "SELECT * FROM users";
if (!empty($this->conditions)) {
            $sql .= " WHERE " . implode(" AND "$this->conditions);
        }
return ["sql" => $sql, "params" => $this->params];
    }
}

$builder = new QueryBuilder();
$query = $builder
    ->where("age"">"18)
    ->where("status""=""active")
    ->build();

print_r($query);
案例2:收集日志消息
classLogger{
private $logs = [];
private $maxSize = 1000;

publicfunctionlog($message, $level = "INFO"){
        $entry = [
"timestamp" => date("Y-m-d H:i:s"),
"level" => $level,
"message" => $message
        ];

        array_push($this->logs, $entry);

// 自动清理旧日志
if (count($this->logs) > $this->maxSize) {
            array_shift($this->logs); // 移除最旧的日志
        }
    }

publicfunctiongetRecentLogs($limit = 10){
return array_slice($this->logs, -$limit);
    }
}
案例3:处理表单多值字段
// 处理多选表单数据
functionprocessMultiSelect($fieldName, $default = []){
    $selected = $default;

if (isset($_POST[$fieldName])) {
        $submitted = (array)$_POST[$fieldName];
        array_push($selected, ...$submitted);
        $selected = array_unique($selected); // 去重
    }

return $selected;
}

// 使用示例
$interests = processMultiSelect("interests", ["coding"]);

性能优化建议

  1. 预分配数组大小(对于非常大数组):

    $largeArray = array_fill(010000null); // 预分配
    // 然后通过索引赋值,而不是array_push
  2. 批量操作优先:

    // 批量添加比循环添加更快
    $data = [];
    $batch = generateLargeBatch(); // 返回大量数据
    array_push($data, ...$batch);
  3. 考虑使用SplFixedArray(对于纯数字索引的大型数组):

    $fixedArray = new SplFixedArray(10000);
    // SplFixedArray在某些场景下性能更好

总结

array_push()函数是PHP数组操作中的重要工具,特别适合:

  • 一次性添加多个元素到数组
  • 需要获取操作后数组长度的场景
  • 实现栈数据结构
  • 批量数据处理

关键要点:

  • 对于单个元素添加,[]语法通常更简洁高效
  • 对于多个元素添加,array_push()更合适
  • 始终注意关联数组和索引数组的区别
  • 在性能敏感场景中,选择合适的添加方式

掌握array_push()及其替代方案,能够帮助您编写更高效、更易维护的PHP代码。根据具体场景选择最合适的数组操作方式,是成为PHP高手的重要一步。

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  1. CONNECT:[ UseTime:0.000576s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000830s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002879s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001093s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000285s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000549s ]
  8. SELECT * FROM `article` WHERE `id` = 465487 LIMIT 1 [ RunTime:0.007146s ]
  9. UPDATE `article` SET `lasttime` = 1770502588 WHERE `id` = 465487 [ RunTime:0.001562s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000228s ]
  11. SELECT * FROM `article` WHERE `id` < 465487 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004157s ]
  12. SELECT * FROM `article` WHERE `id` > 465487 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000441s ]
  13. SELECT * FROM `article` WHERE `id` < 465487 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007035s ]
  14. SELECT * FROM `article` WHERE `id` < 465487 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003812s ]
  15. SELECT * FROM `article` WHERE `id` < 465487 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016698s ]
0.117307s