What are the PHP loop control statements?

php loop control statements include: 1. for loop, used to specify loop conditions and loop body, including three expressions, which respectively control the initialization, conditions and operations after each iteration of the loop; 2. while Loop, execute the code block repeatedly as long as the specified condition is true; 3. do-while loop, execute the loop body once first, and then determine whether the condition is true; 4. foreach loop, used to traverse each element in the array, and assign it to a variable.

The operating system of this tutorial: Windows10 system, PHP version 8.1.3, DELL G3 computer.

In PHP programming, a loop is an important control structure used to repeatedly execute a set of codes. PHP provides a variety of loop control statements, each with different uses and flexibility. This article will introduce commonly used loop control statements in PHP, including for, while, do-while, foreach, etc.

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1. for loop:

The for loop is a common loop statement used to specify loop conditions and loop bodies. It contains three expressions that control the loop's initialization, conditions, and actions after each iteration. The sample code is as follows:

for ($i = 0; $i < 10; $i++) {
    echo $i;
}

The above code will print out numbers from 0 to 9.

2. while loop:

The while loop is used to repeatedly execute a block of code as long as the specified condition is true. It will first determine whether the condition is true before executing the loop body. If it is true, the loop body will be executed, and then the condition will be determined again. The sample code is as follows:

$i = 0;
while ($i < 10) {
    echo $i;
    $i++;
}

The above code also prints numbers from 0 to 9.

3. do-while loop:

The do-while loop first executes the loop body once, and then determines whether the condition is true. If the condition is true, execution of the loop body continues, otherwise the loop ends. The sample code is as follows:

$i = 0;
do {
    echo $i;
    $i++;
} while ($i < 10);

The above code will also print out numbers from 0 to 9.

4. foreach loop:

The foreach loop is used to iterate through each element in the array and assign it to a variable. It iterates through each element of the array until the last element. The sample code is as follows:

$fruits = array("apple", "banana", "orange");
foreach ($fruits as $fruit) {
    echo $fruit;
}

The above code will print out each element in the array in turn.

Conclusion:

This article introduces commonly used loop control statements in PHP, including for, while, do-while and foreach. These loop statements play a role in different scenarios and can easily traverse and process data. In actual programming, choosing appropriate loop control statements can effectively improve the efficiency and readability of the code.

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