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@ 2021-12-10T21:12:51Z

<?php
function esc_attr( $string ) {
    return $string;
}
function sanitize_key( $key ) {
    return $key;
}

function test( $choices ) {
    foreach( $choices as $key => $value ) {
        if ( is_integer( $key ) ) {
            $field_name = "field[$key]";
        } elseif ( is_string( $key ) ) {
            $field_name = sprintf( 'field[%s]', sanitize_key( $key ) );
        } else {
            // may want to throw an error here.
        }
    	
    	printf(
    		'<input name="%s" value="1"/>',
    		esc_attr( $field_name )
    	);
    	echo "\n";
    }
}

echo "An indexed array\n";
$choices = array( 'Red', 'Blue', 'Green' );
test( $choices );

echo "\n\nAssociative array\n";
$choices = array( 'red' => 'Red', 'blue' => 'Blue', 'green' => 'Green' );
test( $choices );

Output for git.master, git.master_jit, rfc.property-hooks: An indexed array <input name="field[0]" value="1"/> <input name="field[1]" value="1"/> <input name="field[2]" value="1"/> Associative array <input name="field[red]" value="1"/> <input name="field[blue]" value="1"/> <input name="field[green]" value="1"/>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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