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
<?php header("content-type:text/html;charset=utf-8"); $subject = array( "Maths" => 95, "Physics" => 90, "Chemistry" => 96, "English" => 93, "Computer" => 98 ); echo "学生成绩:<br><br>"; echo "数学:" . $subject["Maths"], "<br>"; echo "物理:" . $subject["Physics"], "<br>"; echo "化学:" . $subject["Chemistry"], "<br>"; echo "英语:" . $subject["English"], "<br>"; echo "计算机:" . $subject["Computer"], "<br>"; ?>
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
<?php $arr = array( "0" => 7, "1" => 10, "2" => 8, "3" => 5 ); foreach($arr as $key => $value) { echo $key . " => " . $value . "<br>"; } ?>
Output:
Example 3: Use For assigning numeric indexes without using the "=>" symbol
<?php header("content-type:text/html;charset=utf-8"); $name = array("Zack", "Anthony", "Ram", "Salim", "Raghav"); foreach($name as $key => $value) { echo $key . " => " . $value . "<br>"; } ?>
Output:
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