There are several ways to loop through arrays in php

There are three ways to loop through arrays in php, namely: 1. for loop, which traverses the array. The advantage is that only one variable is needed to complete the loop, and the location of each element can be accurately obtained; 2. Foreach loop, this method loops based on the key name of the array; 3. While loop, it is necessary to manually maintain the loop counter, which is more cumbersome than the for loop method.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

There are three ways to loop arrays in PHP:

1. for loop

Use for loop to loop through arrays Traversal, the syntax is as follows:

for ($i = 0; $i < count($arr); $i++) {
    //代码块
}

where $arr is the array to be looped, and $i is the counter of the loop. The advantage of this approach is that only one variable is needed to complete the loop, and the location of each element can be obtained accurately.

2. foreach loop

Using foreach loop can also traverse the array, the syntax is as follows:

foreach ($arr as $value) {
    //代码块
}

$arr ​​in this method is to be looped The array, $value represents the array element currently looped to. Since this method loops based on the key name of the array, the loop counter cannot be precisely controlled.

3. while loop

The last way is the while loop, its syntax is as follows:

$i = 0;
while ($i < count($arr)) {
    //代码块
    $i++;
}

Similar to the for loop, the loop needs to be maintained manually Counter $i. This method is more cumbersome than the for loop method, but it can be more flexible in some cases.

The following is a code example:

$arr = array('apple', 'banana', 'orange');
// for循环
for ($i = 0; $i < count($arr); $i++) {
    echo $arr[$i] . " ";
}
echo "<br>";
// foreach循环
foreach ($arr as $value) {
    echo $value . " ";
}
echo "<br>";
// while循环
$i = 0;
while ($i < count($arr)) {
    echo $arr[$i] . " ";
    $i++;
}

The output result is:

apple banana orange

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