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php-general | 2001032

[PHP] [Fwd: php...] From: George Schlossnagle (george <email protected>)
Date: 03/31/01 

-- 
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s#.#(ord$')-(ord$&)+((index($_,$')-$&)?1002:0)#ego;s#-#((substr($],4,1)-6)?67:$-[0])#eog;$:=$_;print
join('',(map chr$_,reverse
map{substr($:,(3*$_),3)+(11,-109,-14,94,-894,-28,-61,-202,-417,83,-20,-678,53,96,4,-494,82,-869,-826,24,16,-684,-450,-27)[$_]}(0...length($_)/3)),chr(length($_)/2+ord$/),$/);

attached mail follows:

I'm sure you appreciate the importance of transitive equality in programming languages (especially they all aspire to be pseudo-mathematical), which is why I think you'll appreciate this.

<?php

$a = "0"; $b = 0; $c = ""; $d = " ";

$a == $b // T $b == $c // T $a == $c // F!!

$b == $c // T $b == $d // T $c == $d // F!!

?>

Perl, of course, outputs the expected values: $a, $b, $c and $d are equal under '==', and only $a and $b are equal under 'eq'. PHP's '===' operator (its equivalent to 'eq') says that $a, $b, $c and $d are all different.

Doesn't that seem like a fundamental flaw? How can equality NOT be transitive?? How can anyone be expected to write programs in such an environment?

D 

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