Detailed explanation of PHP control process

[Detailed explanation of PHP control process]

In PHP programming, the control process refers to how to make the program execute the code in the order we expect. Through the control process, we It can realize functions such as conditional judgment, loop execution and jump. This article will discuss in detail the control flow structures commonly used in PHP and provide specific code examples to help readers understand and master them.

1. Conditional judgment

Conditional judgment is a structure commonly used in control processes. It determines the execution path of the program by judging whether the condition is true or false. In PHP, conditional judgment is mainly implemented through if statements, else statements and elseif statements.

$score = 80;

if ($score >= 60) {
    echo "及格";
} elseif ($score >= 80) {
    echo "良好";
} else {
    echo "不及格";
}

In the above code, according to different values ​​of $score, the program will output different results, and branch logic can be realized through conditional judgment.

2. Loop execution

Loop execution is another structure commonly used in control flow. Specific code blocks can be repeatedly executed through loop statements, mainly including for loop, while loop and do. ..while loop.

for ($i = 1; $i <= 5; $i++) {
    echo $i . " ";
}

$i = 1;
while ($i <= 5) {
    echo $i . " ";
    $i++;
}

$i = 1;
do {
    echo $i . " ";
    $i++;
} while ($i <= 5);

The above code shows the usage of for loop, while loop and do...while loop, which can repeatedly execute specific code blocks as needed.

3. Jump

During the execution of the program, sometimes it is necessary to jump to a specified location to continue executing the code. PHP provides keywords such as break, continue, and goto to realize the jump. transfer function.

for ($i = 1; $i <= 5; $i++) {
    if ($i == 3) {
        break;
    }
    echo $i . " ";
}

In the above code, when $i is equal to 3, use the break statement to jump out of the loop, and the program will no longer continue to execute the code in the loop. The usage and function of continue and goto are also similar. You can choose the appropriate jump method according to the specific situation.

Through the above detailed explanation and code examples of PHP control process, I believe that readers will have a deeper understanding of control process structures such as conditional judgment, loop execution and jump in PHP. Proper use of the control flow structure can make the program more logical and readable, and improve the quality and efficiency of the code. Hope this article is helpful to readers!

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