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Other changes

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Notices and warnings on arithmetic with invalid strings

New E_WARNING and E_NOTICE errors have been introduced when invalid strings are coerced using operators expecting numbers (+ - * / ** % << >> | & ^) or their assignment equivalents. An E_NOTICE is emitted when the string begins with a numeric value but contains trailing non-numeric characters, and an E_WARNING is emitted when the string does not contain a numeric value.

<?php
'1b' + 'something';

The above example will output:

Notice: A non well formed numeric value encountered in %s on line %d
Warning: A non-numeric value encountered in %s on line %d

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Warn on octal escape sequence overflow

Previously, 3-octet octal string escape sequences would overflow silently. Now, they will still overflow, but E_WARNING will be emitted.

<?php
var_dump("\500");

The above example will output:

Warning: Octal escape sequence overflow \500 is greater than \377 in %s on line %d
string(1) "@"

Inconsistency fixes to $this

Whilst $this is considered a special variable in PHP, it lacked proper checks to ensure it wasn't used as a variable name or reassigned. This has now been rectified to ensure that $this cannot be a user-defined variable, reassigned to a different value, or be globalised.

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Session ID generation without hashing

Session IDs will no longer be hashed upon generation. With this change brings about the removal of the following four ini settings:

  • session.entropy_file
  • session.entropy_length
  • session.hash_function
  • session.hash_bits_per_character

And the addition of the following two ini settings:

  • session.sid_length - defines the length of the session ID, defaulting to 32 characters for backwards compatibility)
  • session.sid_bits_per_character - defines the number of bits to be stored per character (i.e. increases the range of characters that can be used in the session ID), defaulting to 4 for backwards compatibility

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Changes to INI file handling

precision

If the value is set to -1, then the dtoa mode 0 is used. The default value is still 14.

serialize_precision

If the value is set to -1, then the dtoa mode 0 is used. The value -1 is now used by default.

gd.jpeg_ignore_warning

The default of this php.ini setting has been changed to 1, so by default libjpeg warnings are ignored.

opcache.enable_cli

The default of this php.ini setting has been changed to 1 (enabled) in PHP 7.1.2.

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Session ID generation with a CSPRNG only

Session IDs will now only be generated with a CSPRNG.

More informative TypeError messages when NULL is allowed

TypeError exceptions for arg_info type checks will now provide more informative error messages. If the parameter type or return type accepts NULL (by either having a default value of NULL or being a nullable type), then the error message will now mention this with a message of "must be ... or null" or "must ... or be null."

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-migration71.other-changes.html

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References

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