Whether the php array key name should be quoted or not

In PHP, if the array key name is an integer numeric type, you do not need to add quotes; and if the array key name is a string type, you need to add quotes. If a key name in an array is not a number, then the array is an associative array. The key name of the associative array can be any integer or string; and if the key name is a string, add a Delimitation modifier, that is, add single quotes "''" or double quotes """".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

In php, the array key name Whether to add quotes depends on the data type of the key name.

• If the array key name is an integer numeric type, no quotation marks are needed;

"a",2=>"b",3=>"c",4=>"d",5=>"e",);
var_dump($arr);
?>

• If the array key name is a string type, you need to add quotes

"1","a"=>"",2=>"2","b23"=>0,"12r3"=>"blue");
var_dump($arr);
?>

Instructions:

In a PHP array, no matter what type of key name there will be a value corresponding to it, that is, a key/value pair. According to the different data types of the array key names, we can divide the PHP array into There are two types:

• Using numbers as key names is called an indexed array (Indexed Array);

• Using strings or strings, An array in which numbers are mixed as keys is called an Associative Array.

The subscript (key name) of an associative array is composed of a mixture of numeric values ​​and strings. If a key name in an array is not a number, then the array is an associative array.

The key name of the associative array can be any integer or string. If the key name is a string, add a delimiting modifier to the key name - single quote ' ' or double quote " ".

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