What loop statement can be used to traverse an array in PHP

In PHP, you can traverse the array through the "for" or "foreach" loop statement. The for statement traversal is related to array subscripts and is suitable for traversing continuous index arrays. The syntax is "for($i=0;$i$v){//statement block;}". ($arr);$i++){>

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

can be used in PHP Iterate through the array through a "for" or "foreach" loop statement.

1. Use the for loop statement to traverse the array

The for loop will pre-define the variable that controls the number of loops in the for statement. , so the for loop statement can perform loop operations according to the known number of loops, which is suitable for situations where the number of times the script needs to be run is clearly known.

That is, the for statement traversal is related to the array subscript, and is suitable for traversing continuous index arrays.

for ($i=0; $i <数组长度;变量更新--自增或自减) {
    语句块;   
}

• Variable update (expression 3): an expression with an auto-increment or auto-decrement operation. Each time the loop is executed, the value of the counter is immediately modified to make the loop condition gradually becomes "unestablished".

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$array= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
for ($i=0; $i < count($array); $i++) { 
    echo $array[$i] . "<br/>";
} 
?>

##2. Use the foreach statement to traverse the array

foreach is a statement specially designed for traversing arrays. It is a commonly used method when traversing arrays. It provides great convenience in traversing arrays.

The foreach statement traverses arrays and arrays. It has nothing to do with subscripts and can be used for discontinuous index arrays and associative arrays with strings as subscripts.

This statement has two grammatical formats:

• Grammar format 1:

foreach ($array as $value){
    语句块;
}

Traverse the given

$array array and assign the value of the current array to $value in each loop.

• Syntax format 2:

foreach ($array as $key => $value){
    语句块;
}

Traverse the given

$array array, in In each loop, the value of the current array will be assigned to $value, and the key name will be assigned to $key.

Explanation:

When the foreach statement loops, the pointer inside the array will move forward one step, so that the next array element will be obtained in the next loop. Stop traversing and exit the loop until it reaches the end of the array.

Instance 1:

<?php
header("Content-type:text/html;charset=utf-8");
$array= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
foreach ($array as $value) { 
    echo $value . "<br/>";
} 
?>

Output:

香蕉
苹果
梨子
橙子
橘子
榴莲

Instance 2:

<?php
header("Content-type:text/html;charset=utf-8");
$array= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
foreach ($array as $key => $value) { 
    echo "键名为：".$key."，键值为：".$value . "<br/>";
} 
?>

Output:

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