rfc:get_debug_type

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rfc:get_debug_type [2020/02/17 09:43] – marandallrfc:get_debug_type [2020/04/29 19:42] – fix unclosed vote ajf
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   * Date: 2020-02-15   * Date: 2020-02-15
   * Author: Mark Randall, marandall@php.net   * Author: Mark Randall, marandall@php.net
-  * Status: Under Discussion+  * Status: Accepted
   * First Published at: https://wiki.php.net/rfc/get_debug_type   * First Published at: https://wiki.php.net/rfc/get_debug_type
  
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 This RFC proposes to add a new function get_debug_type that will return the given type of a variable. This RFC proposes to add a new function get_debug_type that will return the given type of a variable.
  
-This function would differ from gettype in that it would return native type names, e.g. "int" rather than "integer" and would automatically resolve class names.+This is to replace the following pattern, which may be used to generate debugging messages when dealing with types which cannot be handled by existing PHP runtime checking based on parameter types, such as those coming from an array. 
 + 
 +<code php> 
 +$bar = $arr['key']; 
 +if (!($bar instanceof Foo)) {  
 +  // this shows the most simple of patterns, to get the real type an assoc array 
 +  // must be present to convert long-form "integer" into int etc. 
 +  throw new TypeError('Expected ' . Foo::class . ' got ' . (is_object($bar) ? get_class($bar) : gettype($bar))); 
 +} 
 + 
 +// would become 
 +if (!($bar instanceof Foo)) {  
 +  throw new TypeError('Expected ' . Foo::class . ' got ' . get_debug_type($bar)); 
 +} 
 + 
 +$bar->someFooMethod(); 
 +</code> 
 + 
 +This function would differ from gettype in that it would return native type names, e.g. "int" rather than "integer" and would automatically resolve class names. The following table shows what ''get_debug_type()'' returns for different values, and what ''gettype()'' returns for the same value (if it is different): 
 + 
 +^ Value   ^ get_debug_type() ^ gettype() ^ 
 +| 0       | int | integer | 
 +| 0.1     | float | double | 
 +| true    | bool | boolean | 
 +| false   | bool | boolean | 
 +| "hello" | string | | 
 +| []      | array  | | 
 +| null    | null | NULL | 
 +| A class with name "Foo\Bar" | Foo\Bar  | object | 
 +| An anonymous class | class@anonymous   | object | 
 +| A resource         | resource (xxx)    | resource | 
 +| A closed resource  | resource (closed) | | 
  
-  * 0 => int  (previously: integer) 
-  * 0.1 => float  (previously: double) 
-  * true => bool   
-  * false => bool   
-  * "hello" => string   
-  * [] => array   
-  * null => null   
-  * A class with name "Foo\Bar" => foo\bar  (previously: object) 
-  * An anonymous class => class@anonymous  (previously: object) 
-  * A resource => resource (xxx)  (previously: resource) 
-  * A closed resource => resource (closed)  (previously: resource) 
  
 ===== Backward Incompatible Changes ===== ===== Backward Incompatible Changes =====
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 PHP 8.0 PHP 8.0
  
-===== Proposed Voting Choices ===== +===== Voting =====
-Yes / no vote on adding the new function. +
- +
-Yes / no on resource names be resolved - Would appear as resource(resource_type).+
  
-(Optional) A vote on the name, if there is not a clear majority consensus during RFC discussion.+<doodle title="Add get_debug_type as described" auth="marandall" voteType="single" closed="true"> 
 +   * Yes 
 +   * No 
 +</doodle>
  
  
rfc/get_debug_type.txt · Last modified: 2020/08/01 23:41 by carusogabriel

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