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1. strrpos() and strripos() now use the entire string as a needle. Be aware
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that the existing scripts may no longer work as you expect.
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var_dump(strrpos("ABCDEF","DEF"));
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var_dump(strrpos("ABCDEF","DAF"));
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Will give you different results. The former returns 3 while the latter
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returns false rather than the position of the last occurrence of 'D'.
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The same applies to strripos().
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2. Illegal use of string offsets causes E_ERROR instead of E_WARNING.
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Fatal error: Cannot use string offset as an array in ... on line 1
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3. array_merge() was changed to accept only arrays. If a non-array variable is
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passed, a E_WARNING will be thrown for every such parameter. Be careful
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because your code may start emitting E_WARNING out of the blue.
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4. Be careful when porting from ext/mysql to ext/mysqli. The following
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functions return NULL when no more data is available in the result set
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(ext/mysql's functions return FALSE).
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- mysqli_fetch_array()
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- mysqli_fetch_assoc()
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5. PATH_TRANSLATED server variable is no longer set implicitly under
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Apache2 SAPI in contrast to the situation in PHP 4, where it is set to the
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same value as the SCRIPT_FILENAME server variable when it is not populated
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by Apache. This change was made to comply with the CGI specification.
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Please refer to bug #23610 for further information.
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6. Starting PHP 5.0.0 the T_ML_CONSTANT constant is no longer defined by the
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ext/tokenizer extension. If error_reporting is set to E_ALL notices will
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be produced. Instead of T_ML_CONSTANT for /* */ the T_COMMENT constant
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is used, thus both // and /* */ are resolved as the T_COMMENT constant.
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However the PHPDoc style comments /** */ ,which starting PHP 5 are parsed
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by PHP, are recongnized as T_DOC_COMMENT.
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7. $_SERVER should be populated with argc and argv if variables_order
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includes "S". If you have specifically configured your system to not
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create $_SERVER, then of course it shouldn't be there. The change was to
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always make argc and argv available in the CLI version regardless of the
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variables_order setting. As in, the CLI version will now always populate
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the global $argc and $argv variables.
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8. In some cases classes must be declared before used. It only happens only
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if some of the new features of PHP 5 are used. Otherwise the behaviour is
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Example 1 (works with no errors):
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Example 2 (throws an error):
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class a implements b {
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Fatal error: Class 'a' not found in /tmp/cl.php on line 2
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9. get_class() starting PHP 5 returns the name of the class as it was
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declared which may lead to problems in older scripts that rely on
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the previous behaviour - the class name is lowercased. Expect the
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same behaviour from get_parent_class() when applicable.
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class ExtFooBar extends FooBar{}
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var_dump(get_class($a), get_parent_class($a));
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----------------------------------------------------------------------
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Example code that will break :
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function someMethod($p) {
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if (get_class($p) != 'helpingclass') {
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Possible solution is to search for get_class() and get_parent_class() in
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all your scripts and use strtolower().
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10. get_class_methods() returns the names of the methods of a class as they
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declared. In PHP4 the names are all lowercased.
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var_dump(get_class_methods("Foo"));
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11. Assignment $this is impossible. Starting PHP 5.0.0 $this has special
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meaning in class methods and is recognized by the PHP parser. The latter
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will generate a parse error when assignment to $this is found
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function assignNew($obj) {
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echo "I was executed\n";
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PHP Fatal error: Cannot re-assign $this in /tmp/this_ex.php on line 4