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.

Example F.9. Migration from 2.0: return values, old code

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$fp = fopen($file, "r");

if ($fp == -1);

    echo("Could not open $file for reading<br />\n");

endif; ?>

Example F.10. Migration from 2.0: return values, new code

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$fp = @fopen($file, "r") or print("Could not open $file for reading<br />\n"); ?>

Code Examples / Notes » migration.truefalse

dtampe

Try this: if(0=='FALSE') echo "It works but it should not work"; 1 days of headheache... Hope it helps! DamTam

oliver

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

'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).

Function TRUE/FALSE return values

Example F.9. Migration from 2.0: return values, old code

Example F.10. Migration from 2.0: return values, new code

Code Examples / Notes » migration.truefalse

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