About PHP loops - Detailed explanation of For loop

This article will provide a detailed understanding of the relevant knowledge of php loops and Buddhafor loops.

for loop

The for loop is used when you know in advance the number of times the script needs to run.

Syntax

for (initial value; condition; increment){
Code to be executed;}

Parameters:

Initial value: Mainly initializes a variable value, used to set a counter (but can be any code that is executed once at the beginning of the loop).

Conditions: Restrictions on loop execution. If TRUE, the loop continues. If FALSE, the loop ends.

Increment: Mainly used to increment the counter (but can be any code that is executed at the end of the loop).

Note: The above initial value and increment parameters can be empty, or have multiple expressions (separated by commas).

Example

The following example defines a loop with an initial value of i=1. As long as the variable i is less than or equal to 5, the loop will continue to run. Each time the loop runs, the variable i will be incremented by 1:

Instance

<?phpfor ($i=1; $i<=5; $i++){
    echo "The number is " . $i . "<br>";}?>

Output:

The number is 1
The number is 2
The number is 3
The number is 4
The number is 5

foreach Loop

foreach loop is used to traverse the array.

Syntax

foreach ($array as $value){
    要执行代码;}

Every time you perform a loop, the value of the current array element will be assigned to the $value variable (the array pointer will move one by one). When you perform the next loop, you will See the next value in the array.

Example

The following example demonstratesa loop that outputs the values ​​of a given array:

Example

<?php$x=array("one","two","three");foreach ($x as $value){
    echo $value . "<br>";}?>

Output:

one
two
three

This article explains the usage of loop statements in detail. For more learning materials, please pay attention to the php Chinese website.

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