How to traverse array elements in PHP array learning? Brief analysis of 4 methods

In the previous article, we learned about the creation of PHP arrays. If you are interested, you can click on the link to view → "How to create and initialize one-dimensional arrays (detailed code explanation)". After creating the array, you need to perform operations. Traversing the array is a regular operation. So how to traverse the array elements in PHP? Today we will share with you 3 common methods.

This article will introduce 4 common methods through actual code examples: for loop, foreach statement, while loop each() list(), do-while loop array pointer.

Method 1: Use for loop statement

In the previous PHP loop series article "PHP loop learning three: How to use for loop In "Statement Traversing Arrays", we introduced the for loop and how to use this loop to traverse the array. This article will not introduce it in detail. Let’s take a closer look through the code example:

<?php
header("Content-type:text/html;charset=utf-8");
$array= array(2,"数学","梨子",3.14,"榴莲",12);
for ($i=0; $i < count($array); $i++) { 
    echo $array[$i] . "<br/>";
} 
?>

Output result:

2
数学
梨子
3.14
榴莲
12

Method 2: Use foreach loop statement

Similarly, in the previous PHP loop series article "PHP Loop Learning 4: How to use the foreach statement to traverse and modify array elements", we introduced the use of foreach loop Iterate over the 2 structures of the array. This article will not go into details. Let’s take a closer look at the code example:

<?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 $val){
    echo "值是：" . $val ;
    echo "<br/>";
}
echo "<br/>";
foreach ($array as $key => $value) { 
    echo "键名为：".$key."，键值为：".$value . "<br/>";
} 
?>

Output result:

## Method 3: Use while loop each() list()

<?php
header("Content-type:text/html;charset=utf-8");
$array= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
while( list($key, $val) = each($array) ) {
    echo "$key => $val<br>";
}
?>

Method 4: Use do-while loop next() key() current()

• next() function can return the value of the next element pointed to by the internal pointer of the array, and returns FALSE when there are no more elements.

• key() function is used to obtain the key name of the current element in the array.

• current() function returns the key value of the current element of the array.

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

PHP Loop Learning 2: How to use do-while loop statements" to learn about do-while loop statements.

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