Help, like this assignment is not legal?

$a = "$a 1
$a 2
$a 3
$a 4
$a 5
";

Reply to discussion (solution)

As long as $a 1, $a 2, $a 3, $a 4, $a 5 exist, is legal

Naming rules for variables:

1. Variable names are strictly case-sensitive.

2, built-in structure and keywords, as well as user-defined class names and function names are case-insensitive.

3, only the letter or the underscore begins.

Variable naming method:

lowercase, words can express, words are underlined across

Example: $name $post _form $name _arr.

Fit the law you do not know the test, there is this time the conclusion of the early ~ ~

Thank you, everyone upstairs, in fact, have been tested to ask.
Note that the quotation marks may also act as a connector, which is connected to the key number.

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