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This article focuses on "how to use the For loop and Foreach loop in PHP". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use the For loop and Foreach loop in PHP.

For Loop and foreach Loop in PHP

For cycle

The syntax and logic format of the for loop is a little different from the while and do while loop statements we saw earlier. The for loop pre-defines the variables that control the number of loops in the for statement. For loops are mostly used to know in advance how many times the loop needs to be run.

The syntax format of the For loop is as follows:

For (initial expression; expression condition judgment; variable update) {Loop Action;}

Initialization expression: an initialization assignment that can assign multiple codes at the same time, usually used to declare the initial value of a counter.

Expression condition judgment: used to control whether to execute the code in the body of the loop, that is, the restriction condition of the loop execution; if the judgment condition value is TRUE, then continue the loop and execute the loop statement. If the condition value is FALSE, the loop is terminated.

Variable update: each time the loop is executed, the variable is updated to proceed to the next loop.

Examples are as follows:

Output result:

The for loop can execute not only one condition, but also multiple conditions, as shown in the following example:

Output result:

For loop statements can also be nested together like while statements, that is, one or more additional for loop statements are included in the for loop statement. We can use the for loop of this method to output the multiplication table we learned in primary school. The example is as follows:

Output result:

Foreach cycle

The foreach loop structure of PHP is a common method when traversing arrays.

The syntax format of the foreach loop is as follows:

Foreach (array variable to loop as [key variable = >] value variable) {/ / loop structure}

This usage is fixed, putting in the array that needs to be looped. As as a fixed keyword, the following key variable is optional, you can define a variable at will, each cycle, foreach grammar will take out the key assigned to the key variable, the following value variable is required. Each time you loop, you put the value in the value variable.

Examples are as follows:

At this point, I believe you have a deeper understanding of "how to use the For loop and Foreach loop in PHP". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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