rfc:list_reference_assignment

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rfc:list_reference_assignment [2016/12/31 18:29] – bp1222rfc:list_reference_assignment [2017/01/11 22:38] – bp1222
Line 26: Line 26:
 $a = $array[0]; $a = $array[0];
 $b =& $array[1]; $b =& $array[1];
 +</code>
 +
 +<code php>
 +/* Note; []= syntax works the same, so the following is functionally equivalent to the example */
 +[$a, &$b] = $array;
 </code> </code>
  
Line 82: Line 87:
 (notice here that the reference exists on ''$array[1][0]'' since $a is still in scope after the foreach()) (notice here that the reference exists on ''$array[1][0]'' since $a is still in scope after the foreach())
  
-The advantage of adding support for this is that it allows you to use reference assignment for multiple variables at once, which is not currently possible. The syntax here is different from the traditional assignment syntax which places the & before the rvar, not the lvar, but the advantage here is that you can reference assign some, but not all of the variables in list(). 
  
-The RFC also takes into account the possibility of objects being the lval of the assignment implementing ArrayAccess.+The predominant advantage of adding support for this is that it allows you to use reference assignment for multiple variables at once, which is not currently possible. The syntax here is different from the traditional assignment syntax which places the ''&'' before the right-side value, not the left-side value; the advantage here is that you can reference assign some, but not all of the variables in list(). [See Open Issues] 
 + 
 +The RFC also takes into account the possibility of objects being the r-val of the assignment implementing ArrayAccess.
 <code php> <code php>
 class RefArr implements ArrayAccess { class RefArr implements ArrayAccess {
Line 127: Line 133:
  
 ===== Open Issues ===== ===== Open Issues =====
-None Presently+==== Both Syntax ==== 
 +The proposal follows the syntactic choice in allowing you to specify to each element in the list() which should be referenced into the target array.  The question if if you wanted to reference everything, should we also support the syntax: 
 +<file php> 
 +<?php 
 +$array = [1, 2, 3]; 
 +list($a, $b, $c) =& $array; 
 +</file> 
 + 
 +Which would be identical to proposed syntax: 
 +<file php> 
 +<?php 
 +$array = [1, 2, 3]; 
 +list(&$a, &$b, &$c) = $array; 
 +</file>
  
 ===== Proposed Voting Choices ===== ===== Proposed Voting Choices =====
rfc/list_reference_assignment.txt · Last modified: 2017/12/09 12:43 by nikic

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