What is the meaning of foreach as in php

In PHP, "foreach as" is a loop statement used to traverse an array. The syntax is "foreach($array as $value){to execute code;}". Each time the loop is performed, the current array The value of the element will be assigned to the $value variable.

The operating environment of this tutorial: windows10 system, PHP7.1 version, DELL G3 computer

What is the meaning of foreach as in php

The foreach loop is used to traverse the array.

Syntax

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

Every time you 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 loop next time, you will See the next value in the array.

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

Every time you loop, the keys and values ​​of the current array elements will be assigned to the $key and $value variables (the numeric pointers will move one by one). When you perform the next loop, you will see the array. The next key and value in .

Example

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

Example

<?php
$x=array("Google","Runoob","Taobao");
foreach ($x as $value)
{
    echo $value . PHP_EOL;
}
?>

Output:

Google
Runoob
Taobao

The following example demonstrates a loop that outputs the keys and values ​​of a given array:

<?php
$x=array(1=>"Google", 2=>"Runoob", 3=>"Taobao");
foreach ($x as $key => $value)
{
    echo "key  为 " . $key . "，对应的 value 为 ". $value . PHP_EOL;
}
?>

Output:

key  为 1，对应的 value 为 Google
key  为 2，对应的 value 为 Runoob
key  为 3，对应的 value 为 Taobao

Recommended learning: "PHP Video Tutorial"

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