rfc:comparison_inconsistency

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rfc:comparison_inconsistency [2013/12/01 02:56] – [Conversion/comparison] yohgakirfc:comparison_inconsistency [2014/01/08 01:56] – yohgaki
Line 137: Line 137:
   "          b"   "          b"
  
-=== String Integer conversion ===+==== String Integer conversion ====
  
 PHP converts "integer like string to integer". PHP converts "integer like string to integer".
Line 156: Line 156:
  
 https://bugs.php.net/bug.php?id=66211 https://bugs.php.net/bug.php?id=66211
 +
 +==== NAN/INF of float ====
 +
 +NAN/INF issue.
 +
 +  $f = NAN;
 +  var_dump(++$f);                 // float NAN
 +  var_dump((float) NAN);   // float NAN
 +  var_dump((int) NAN);       // int -2147483648 -> what?
 +  var_dump((bool) NAN);   // bool true -> makes sense
 +  
 +  $f = INF;
 +  var_dump(++$f);                         // float INF
 +  var_dump((float) INF);             // float INF
 +  var_dump((int) INF);                 // int 0 -> what?
 +  var_dump((bool) INF);             // bool true -> so why int 0?
 +  var_dump((int) (bool) INF);   // int 1
 +
 +E_WARNING for these invalid/unreliable operations might be better.
 + 
 +This could be mitigated by GMP float support.
 +
 +
 +==== Object Array conversion of numeric property/index ====
 +
 +https://bugs.php.net/bug.php?id=66173
 +
 +  $ php -v
 +  PHP 5.5.7 (cli) (built: Dec 11 2013 07:51:06) 
 +  Copyright (c) 1997-2013 The PHP Group
 +  Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies
 +  
 +  $ php -r '$obj = new StdClass; $obj->{12} = 234; ${1} = 567; var_dump($obj, ${1}); $ary = (array)$obj; var_dump($ary, $ary[12]);'
 +  object(stdClass)#1 (1) {
 +    ["12"]=>
 +    int(234)
 +  }
 +  int(567)
 +
 +
 +  Notice: Undefined offset: 12 in Command line code on line 1
 +  array(1) {
 +    ["12"]=>
 +    int(234)
 +  }
 +  NULL <= SHOULD BE int(234)
 +
 +
 +
 +
 ==== Function/Method ==== ==== Function/Method ====
 +
 +=== is_numeric ===
 +
 +https://bugs.php.net/bug.php?id=66399
 +
 +
 +=== base_convert ====
 +
 +https://wiki.php.net/rfc/base-convert
 +
  
 === min() function === === min() function ===
Line 190: Line 250:
 There are bug reports that complain return value inconsistency. The document could be improved with more explanations. There are bug reports that complain return value inconsistency. The document could be improved with more explanations.
  
-== Related Bug Reports ==+**Related Bug Reports**
   * https://bugs.php.net/bug.php?id=60338 (Returns value for wrong key())   * https://bugs.php.net/bug.php?id=60338 (Returns value for wrong key())
   * https://bugs.php.net/bug.php?id=64860 (returns NULL for wrong file parameter)   * https://bugs.php.net/bug.php?id=64860 (returns NULL for wrong file parameter)

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