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

<?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:

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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