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@ 2020-10-17T22:43:14Z

<?php
class PO {
    
    public $entries = array( "1\n", "a\n\n" );
    
    public static function export_entry( &$entry ) {
        return trim($entry);
    }

	function export_entriesA() {
		return implode( "\n\n", array_map( array( 'PO', 'export_entry' ), $this->entries ) );
	}
	
	function export_entriesB() {
	    array_walk( $this->entries, array( 'PO', 'export_entry' ) );
		return implode( "\n\n", $this->entries );
	}

	function export_entriesC() {
	    $entries = $this->entries;
	    array_walk( $this->entries, array( 'PO', 'export_entry' ) );
		return implode( "\n\n", $entries );
	}

}

$obj = new PO();
var_dump($obj->export_entriesA());
var_dump($obj->entries);
var_dump($obj->export_entriesC());
var_dump($obj->entries);
var_dump($obj->export_entriesB());
var_dump($obj->entries);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: PO::export_entry(): Argument #1 ($entry) must be passed by reference, value given in /in/KbpLJ on line 11 Warning: PO::export_entry(): Argument #1 ($entry) must be passed by reference, value given in /in/KbpLJ on line 11 string(4) "1 a" array(2) { [0]=> string(2) "1 " [1]=> string(3) "a " } string(7) "1 a " array(2) { [0]=> string(2) "1 " [1]=> string(3) "a " } string(7) "1 a " array(2) { [0]=> string(2) "1 " [1]=> string(3) "a " }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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