Руководство по PHP
Пред. | Приложение D. Migrating from PHP/FI 2 to PHP 3 | След.

# Other incompatibilities

- The PHP 3.0 Apache module no longer supports Apache versions prior to 1.2. Apache 1.2 or later is required.

- echo() no longer supports a format string. Use the printf() function instead.

- In PHP/FI 2.0, an implementation side-effect caused `$foo[0]` to have the same effect as `$foo`. This is not true for PHP 3.0.

- Reading arrays with `$array[]` is no longer supported

  That is, you cannot traverse an array by having a loop that does `$data = $array[]`. Use current() and next() instead.

  Also, `$array1[] = $array2` does not append the values of `$array2` to `$array1`, but appends `$array2` as the last entry of `$array1`. See also multidimensional array support.

- `"+"` is no longer overloaded as a concatenation operator for strings, instead it converts it's arguments to numbers and performs numeric addition. Use `"."` instead.

Пример D-11. Migration from 2.0: concatenation for strings

`echo "1" + "1";`

In PHP 2.0 this would echo 11, in PHP 3.0 it would echo 2. Instead use:

`echo "1"."1";`

`$a = 1; $b = 1; echo $a + $b;`

This would echo 2 in both PHP 2.0 and 3.0.

`$a = 1; $b = 1; echo $a.$b;`

This will echo 11 in PHP 3.0.

Пред. | Начало | След.
Function `TRUE`/`FALSE` return values | Уровень выше | Отладка PHP