The role and examples of the endwhile keyword in PHP

The role and examples of the endwhile keyword in PHP

In PHP, endwhile is a control structure used to implement while loops. Its function is to allow the program to repeatedly execute a block of code when specified conditions are met until the conditions are no longer met.

The syntax of endwhile is as follows:

while (condition):
    // 循环体代码
endwhile;

In this syntax, condition is a logical expression. When the value of the expression is true, the code in the loop body will be executed. When the code in the loop body is executed, the value of condition will be judged again. If it is still true, the loop body will be executed again. This process will be repeated until the value of condition is false and the loop terminates.

The following is an example of using endwhile:

<?php
$i = 0;
$num = 5;

while ($i < $num):
    echo "当前数字是: " . $i . "<br>";
    $i++;
endwhile;
?>

In this example, the initial value of the variable $i is 0 and the value of $num is 5. After entering the while loop, it will first determine whether $i is less than $num. Since the initial value of $i is 0, the condition is met, so the code in the loop body is executed. The code in the loop body prints out the value of the current number and adds 1 to the value of $i. Then, it is judged again whether $i is less than $num. If the condition is still met, the loop body will be executed again until the value of $i is no longer less than $num. After each loop execution, the value of $i will increase by 1 until the loop ends.

The output of the above code is as follows:

当前数字是: 0
当前数字是: 1
当前数字是: 2
当前数字是: 3
当前数字是: 4

As you can see, in the loop body, the value of the current number increases from 0 to 4 until the condition is no longer met and the loop ends.

It should be noted that when using endwhile, the end of the loop body code block must end with a semicolon, otherwise it will cause a syntax error.

In summary, the endwhile keyword is used to implement a while loop in PHP, controlling the execution of the loop body by specifying conditions. Its syntax is concise and clear, and it can easily implement the function of repeatedly executing a certain piece of code.

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