Function TRUE/FALSE return values

Most internal functions have been rewritten so they return TRUE when successful and FALSE when failing, as opposed to 0 and -1 in PHP/FI 2.0, respectively. The new behaviour allows for more logical code, like $fp = fopen("/your/file") or fail("darn!");. Because PHP/FI 2.0 had no clear rules for what functions should return when they failed, most such scripts will probably have to be checked manually after using the 2.0 to 3.0 convertor.

Пример D-9. Migration from 2.0: return values, old code $fp = fopen($file, "r"); if ($fp == -1);     echo("Could not open $file for reading<br />\n"); endif;

Пример D-10. Migration from 2.0: return values, new code $fp = @fopen($file, "r") or print("Could not open $file for reading<br />\n");

Other incompatibilities Short-circuited boolean evaluation

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Last updated: Sat, 27 Jan 2007

 

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Function TRUE/FALSE return values

oliver at hankeln-online dot de
07-Aug-2002 08:22

I guess you are indeed wrong. You are right, 'FALSE' is beeing evaluated as a string. But it is compared with a number, so automatic type conversion takes place. 'FALSE' as well as 'FOO' and so on are converted to 0. And (0==0) is obviously true. So the number does matter. Try an other number...

Oliver

wildpeaks at warpdawg dot com
06-Aug-2002 07:30

'FALSE' is interpreted as a string containing the word false and not as a boolean value, and comparing a non-null string to a number, whatever the number is, returns true (i may be wrong).

dtampe at groupadress dot com
25-Oct-2001 10:27

Try this:

if(0=='FALSE')
      echo "It works but it should not work";

1 days of headheache...

Hope it helps!
DamTam

add a note

Other incompatibilities Short-circuited boolean evaluation

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Last updated: Sat, 27 Jan 2007