PHP 手冊
前一頁 | 附錄 D. Migrating from PHP/FI 2 to PHP 3 | 下一頁

# 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.

範例 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;`

範例 D-10. Migration from 2.0: return values, new code

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

前一頁 | 內容 | 下一頁
Short-circuited boolean evaluation | 上一層 | Other incompatibilities