EN条件 while 条件为真就会执行代码. while(条件为真){ 执行的代码; } do…while 先执行后判断条件,如果为真则循环. do{ 执行的代码; }while(条件为真); 计数 for 根据写的次数确定循环次数. for(初始化循环计数器的值; 评估每个循环迭代; 增加循环计数器的值){ 执行的代码; } foreach 适合用于数组循环,遍...
Check in your browser that your Apache Web Server is running 如果这个屏幕加载,您已经成功地在开发机器上安装了 Apache 和 PHP!地址http://localhost是您正在使用的当前电脑的别名。使用 XAMPP 时,在浏览器中导航到http://localhost会告诉服务器打开 web 根目录。这是包含在 XAMPP 安装目录中的htdocs文件夹。...
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If the button is pressed the robot will perform a song. The if statement tests whether the statement within the brackets is true. The == operator tests whether the two options are equivalent. In this case they are and we are using the echo statement to write the status to the page. ...
Break: This statement is used in a looping construct to terminate the execution of the iteration and to immediately execute the next code snippet outside the scope of the iterating statement. Continue: This statement is used to skip the current iteration of the loop and continue to execute the...
function due to PHP’s reference counting mechanism. If the variableswouldnothavebeenmodifiedinstep3thenvariablea andbwouldstillpointtothesamevariablecontainerwhichwouldhavearefcountvalueof2.Inthissituation,acopyofthevariablecontainerthatwascreatedwiththestatementa = = “ this is ” would not have been ...
You will learn about PHP switch-case statement in thenext chapter. The Ternary Operator The ternary operator provides a shorthand way of writing theif...elsestatements. The ternary operator is represented by the question mark (?) symbol and it takes three operands: a condition to check, a re...
There are many names for this construct. Theone liner ifis also known as theternary operatorif you want to look it up in thePHP documentation. It has also been called theshort if statementand thesingle line if statement. If you are like me, and continually having to look this up – her...
Within this example, we will get the current day using thedate()function and store it in a variable called “$current_day“. Using theifstatement within our PHP script, we will check to see if the current day equals “Mon“. If our day is Monday, then our script willuse the echo st...
The arguments in PHP functions may have implicit values. An implicit value is used if no value is provided. implicit_value.php <?php function power($a, $b=2) { if ($b == 2) { return $a * $a; } $value = 1; for ($i = 0; $i < $b; $i++) { ...