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The compact() function creates an array including variable names and their values
compact ( [mixed $varname1 , [mixed $... ] );
Create an array containing variables and their values.
For each parameter, compact() looks up the variable name in the current symbol table and adds it to the output array, with the variable name as the key and the content of the variable as the value of the key. Simply put, it does the opposite of extract(). Returns the array after adding all variables.
Returns the output array, which includes all the added variables.
If the string points to an undefined variable, compact() will produce an E_NOTICE level error.
| Number | Parameters and Description |
|---|---|
| 1 | varname1(Required) The compact() function accepts a variable number of arguments. Each argument can be a string containing a variable name or an array containing variable names, and this array can also contain other arrays whose unit content is variable names. compact() can process recursively. |
The compact() function uses the given values to create a key-value pair array
<?php
$city = "San Francisco";
$state = "CA";
$event = "SIGGRAPH";
$location_vars = array("city", "state");
$result = compact("event", "nothing_here", $location_vars);
print_r($result);
?>Test to see‹/›Output Result:
Array ( [event] => SIGGRAPH [city] => San Francisco [state] => CA )