What is the use of the '=>' symbol in PHP? (code example)

The "=>" symbol is very common in PHP scripts, so what is the use of the "=>" symbol? The following article will introduce you to the "=>" symbol and briefly introduce how to use the "=>" symbol. I hope it will be helpful to everyone.

PHP's "=>" symbol

In PHP"=> The ;" symbol is used to allocate key-value pairs in an array, mainly used in associative arrays. [Video tutorial recommendation:PHP tutorial]

Basic sentence structure:

key => value

Explanation: The value on the left side of the "=>" symbol is called the key, and the value on the right side is called key value.

Examples of using the "=>" symbol

The following is a simple code example to introduce how to use the "=>" symbol.

Example 1: Create an associative array using "=>" notation

 95, "Physics" => 90, "Chemistry" => 96, "English" => 93, "Computer" => 98 ); echo "学生成绩:

"; echo "数学:" . $subject["Maths"], "
"; echo "物理:" . $subject["Physics"], "
"; echo "化学:" . $subject["Chemistry"], "
"; echo "英语:" . $subject["English"], "
"; echo "计算机:" . $subject["Computer"], "
"; ?>

Output:

' symbol in PHP? (code example)" > symbol in PHP? (code example)" title="155133715739596What is the use of the => symbol in PHP? (code example)" alt="What is the use of the => symbol in PHP? (code example)"/>

Example 2: Create a numeric index array using the "=>" notation

 7, "1" => 10, "2" => 8, "3" => 5 ); foreach($arr as $key => $value) { echo $key . " => " . $value . "
"; } ?>

Output:

Example 3: Use For assigning numeric indexes without using the "=>" symbol

 $value) { echo $key . " => " . $value . "
"; } ?>

Output:

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