Prevent int overflow on $decimals in number_format

Closes GH-11714.
Closes GH-11649.

Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as

Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as 3.0 states "php 5.1.1, 4.1.1, and earlier".
3. In some license comments is "at through the world-wide-web" while most is without "at", so deleted.
4. fixed indentation in some files before |

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Introduce pseudo-keyword ZEND_FALLTHROUGH

And use it instead of comments

Promote a few remaining errors in ext/standard

Closes GH-6110

decbin/decoct/dechex optimization.

Add "const". Move constant strings to read-only memory.

Allow number_format to be only passed 3 arguments

Closes GH-5977

Add more argument types to stubs

Closes GH-5943

Remove proto comments from C files

Closes GH-5758

Constify char * arguments of APIs

Closes GH-5676.

Improve a last couple of argument error messages

Closes GH-5404

Improve argument error messages in ext/standard

Closes GH-5198

Use RETURN_THROWS() after try_convert_to_string()

Use RETURN_THROWS() after zend_throw_exception() in most of the extensions

Use RETURN_THROWS() when an exception is thrown

Closes GH-5036

Convert zend_parse_parameters_none() to fast ZPP in standard lib

Closes GH-5037

Promote warning to exception in log() function

Remove unnecessary C99 checks for maths functions

Add Z_PARAM_STRING/ARRAY_OR_NULL convenience macros

Promote base_convert "invalid base" errors to ValueError

Expect number argument in round()

Fix miscellaneous typos in docs and error messages

Closes GH-4863.

Add fdiv() function

The fdiv() function is part of the fmod() / intdiv() family. It
implements a floating-point division with IEEE-754 semantics.
That is, division by zero is conside

Add fdiv() function

The fdiv() function is part of the fmod() / intdiv() family. It
implements a floating-point division with IEEE-754 semantics.
That is, division by zero is considered well-defined and does not
trigger any kind of diagnostic. Instead one of INF, -INF or NAN
will be returned, depending on the case.

This is in preparation for throwing DivisionByZeroError from the
standard division operator.

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Add missing zend_parse_parameters_none() checks

Closes GH-4796.

Remove mention of PHP major version in Copyright headers

Closes GH-4732.