第一章,设置环境,介绍了如何设置不同的开发环境,包括在 Windows、不同的 Linux 发行版上安装 NGINX、PHP 7 和 Percona Server,以及为开发目的设置 Vagrant 虚拟机。 第二章,PHP 7 的新特性,介绍了 PHP 7 引入的主要新特性,包括类型提示、组使用声明、匿名类和新操作符,如太空船操作符、空合并操作符和统一变...
$variableName = “score”; $$variableName = 90; echo $score; // 输出 90 “` 在这个例子中,我们使用$variableName的值作为变量名来声明了一个新的变量$score,并且给它赋了一个值。最后,我们输出$score的值,得到了90。 3. 变量的作用域 在PHP中,变量的作用域指的是变量的可见性或访问范围。PHP有几...
<?php function increment() { static $counter = 0; $counter++; echo "Counter value: " . $counter . "<br>"; } increment(); increment(); increment(); ?> 以上代码在PHP8中运行的结果为: Counter value: 1 Counter value: 2 Counter value: 3 在上面的代码中,我们定义了一个名为 $counte...
getRange - Get a substring of the string stored at a key getSet - Set the string value of a key and return its old value incr, incrBy - Increment the value of a key incrByFloat - Increment the float value of a key by the given amount mGet - Get the values of all the given keys...
A URL variable in action 动态包含页面视图 动态站点导航即将完成。它工作得很好,除了当导航项目被点击时页面视图没有被加载。让我们通过更新index.php中的代码来改变这一点,如下所示: <?php error_reporting( E_ALL ); ini_set( "display_errors", 1 ); ...
PHP 8.3 引入了新的增减函数 str_increment(string string)和strdecrement(stringstring),它们通过加减 1 来实现对参数的增减操作。换句话说,v++等同于v += 1,v−−等同于v -= 1。 对于以下任一情况,函数将抛出 ValueError: $string 为空字符串; $string 不是由字母和数字 ASCII 字符组成。 另外,如果字...
<?php function test() { static $a = 0; echo $a; $a++; } ?> Now, $a is initialized only in first call of function and every time the test() function is called it will print the value of $a and increment it. Static variables also provide one way to deal with recursive functi...
Fat-Free automagically populates the globalPARAMSarray variable with the value of the captured strings in the URL. The$f3->get()call inside the callback function retrieves the value of a framework variable. You can certainly apply this method in your code as part of the presentation or busi...
In previous versions of Laravel, the$keywas passed first. Since most use cases are only interested in the$valueit is now passed first. You should do a "global find" in your application for these methods to verify that you are expecting the$valueto be passed as the first argument to your...
Instead, you should only pass a system generated unique ID such as an auto-incrementing ID or UUID from an Eloquent model instance. Otherwise, your application will be vulnerable to an SQL injection attack.Instead of passing the model key's value to the ignore method, you may also pass ...