How many kinds of loop statements are there in php
Editor to share with you how many kinds of circular sentences in php, I believe most people do not know much, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!
There are four kinds of loop statements. They are: 1, for loop, syntax "for (initial value; condition; added value) {loop body}"; 2, dowhile loop, syntax "do {loop body} while (condition)"; 3, while loop, syntax "while (condition) {loop body}"; 4, foreach loop.
This article operating environment: Windows10 system, PHP7.1 version, Dell G3 computer.
There are several kinds of loop statements in php
In PHP, the following loop statements are provided:
1. While-executes the code block in a loop as long as the specified condition is true
2. Do...while-first execute the code block once, and then repeat the loop when the specified condition holds
3. For-the number of times that the code block is executed in a loop
4. Foreach-loops the code block based on each element in the array
Examples are as follows:
For cycle
Grammar rules:
For (initialization count initial value; judgment condition; increase count value) {loop body;}
While cycle
rule of grammar
While (judgment condition) {cyclic body;}
The while cycle first judges the cycle conditions, and then carries on the cycle. When the conditions are not met, jump out of the cycle.
Do while cycle
rule of grammar
Do {cyclic body;} while (judgment condition)
The do while loop first enters the loop and judges the conditions of the loop. So no matter whether the judgment condition is true or false, there is at least one cycle.
Foreach cycle
rule of grammar
Foreach ($array as $value) {execute code;}
Or
Foreach ($array as $key = > $value) {execute code;}
$array: array $value: array key value $key: array key name.
Foreach is used for array traversal. Loop one at a time so that the current value is assigned to the $value variable, and the array pointer moves one by one to the last element.
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