Which symbol in php can declare an array-PHP Problem-php.cn

The "[]" symbol in php can declare an array. Two declaration methods: 1. Use the "$array variable name = [element value]" statement. "[]" can contain multiple value lists, separated by commas. If the value list is omitted, an empty array is declared; 2 , use "$array variable name [subscript] = value" to directly declare the array and assign a value to the specified subscript element.

Which symbol in php can declare an array

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

"[ in php ]" symbol can declare an array.

In PHP, square brackets "[]" are also called "array literals". There are two ways to use them to declare an array.

Method 1. Use “$array variable name=[element value]”

"[]" does not contain a value, then an empty array is defined:

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Which symbol in php can declare an array

"[]" can also contain multiple value lists, with commas between values Separate;

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Which symbol in php can declare an array

"1","a"=>"red",2=>"2","b"=>"green","c"=>"blue"]; var_dump($arr); ?>

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Which symbol in php can declare an array

##Method 2, use "$array Variable name [subscript] = value”

This method can directly declare an array and assign a value to the specified subscript element.

The subscript (index value) can be a string or an integer, and the subscript needs to be wrapped with

[ ].

Example 1:

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Output result:

Which symbol in php can declare an array

Example 2:

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Output result:

Which symbol in php can declare an array

It can be seen that when we do not specify a specific index value within square brackets, the default is a numeric index, and the index value increases sequentially starting from 0 by default.

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