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I'd just come across a very weird bit of php code:
$oink{'pig'} = 1; var_dump($oink); $oink{'pig'} = '123123'; echo $oink{'pig'}; /* => 123123 */ echo $oink['pig']; /* => 123123 */ It works like an array, but nowhere mentioned in the manual. What is this?
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Curly brackets are commonly used in programming languages such as C, Java, Perl, and PHP to enclose groups of statements or blocks of code.
Introduction. PHP allows both square brackets and curly braces to be used interchangeably for accessing array elements and string offsets. For example: $array = [1, 2]; echo $array[1]; // prints 2 echo $array{1}; // also prints 2 $string = "foo"; echo $string[0]; // prints "f" echo $string{0}; // also prints "f"
The symbols "{" and "} are called braces, curly braces or curly brackets. Braces are used as bare delimiters when there are nested parentheses, in much the same way as square brackets. Braces are used in the list notation for sets. They are also used in setbuilder notation..
In PHP, elements can be added to the end of an array by attaching square brackets ([]) at the end of the array's name, followed by typing the assignment operator (=), and then finally by typing the element to be added to the array. Ordered Arrays.
It is mentioned in the manual. {} is just an alternative syntax to [] § Accessing array elements with square bracket syntax. This method is deprecated as of PHP 7.4.0 and no longer supported as of PHP 8.0.0.
Note:
Prior to PHP 8.0.0, square brackets and curly braces could be used interchangeably for accessing array elements (e.g. $array[42] and $array{42} would both do the same thing in the example above). The curly brace syntax was deprecated as of PHP 7.4.0 and no longer supported as of PHP 8.0.0.
The same goes the strings § String access and modification by character :
Characters within strings may be accessed and modified by specifying the zero-based offset of the desired character after the string using square array brackets, as in
$str[42]. Think of a string as an array of characters for this purpose. [...]Note: Prior to PHP 8.0.0, strings could also be accessed using braces, as in $str{42}, for the same purpose. This curly brace syntax was deprecated as of PHP 7.4.0 and no longer supported as of PHP 8.0.0.
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