Make sure T_ERROR is returned for all lexer exceptions

This originally manifested as a leak in oss-fuzz #18000. The following
is a reduced test case:

<?php
[

Make sure T_ERROR is returned for all lexer exceptions

This originally manifested as a leak in oss-fuzz #18000. The following
is a reduced test case:

<?php
[
5 => 1,
"foo" > 1,
" " => "" == 0
];
<<<BAR
$x
BAR;

Because this particular error condition did not return T_ERROR,
EG(exception) was set while performing binary operation constant
evaluation, which checks exceptions for cast failures.

Instead of adding this indirect test case, I'm adding an assertion
that the lexer has to return T_ERROR if EG(exception) is set.

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Replace "unexpected character" warning with ParseError

Closes GH-4767.

Merge branch 'PHP-7.4'

Fixed bug #78604

<?php followed by EOF is valid since PHP 7.4.

Merge branch 'PHP-7.4'

Merge branch 'PHP-7.3' into PHP-7.4

Don't throw warnings during heredoc scan-ahead

Otherwise these warnings will turn up twice (or more...)

Merge branch 'PHP-7.4'

Fix double-free on invalid large octal with separators

To clean up the mess here a bit, check for invalid octal digits
with an explicit loop instead of mixing this into the string to

Fix double-free on invalid large octal with separators

To clean up the mess here a bit, check for invalid octal digits
with an explicit loop instead of mixing this into the string to
number conversion.

Also clean up some type usage.

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Merge branch 'PHP-7.4'

* PHP-7.4:
Fix #78454: Consecutive numeric separators cause OOM error

Fix #78454: Consecutive numeric separators cause OOM error

Resolves out of memory error when consecutive numeric separators follow a binary/hex literal.

Merge branch 'PHP-7.4'

* PHP-7.4:
Fix #78441: Parse error due to heredoc identifier followed by digit

Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
Fix #78441: Parse error due to heredoc identifier followed by digit

Fix #78441: Parse error due to heredoc identifier followed by digit

Since digits are allowed for identifiers, we have to cater to them as
well.

Merge branch 'PHP-7.4'

Revert "Drop free_filename field from zend_file_handle"

This reverts commit e0eca262852dba1a78afcde64a49126c81fead1a.

free_filename is used by the wincache extension, restore this

Revert "Drop free_filename field from zend_file_handle"

This reverts commit e0eca262852dba1a78afcde64a49126c81fead1a.

free_filename is used by the wincache extension, restore this
field for PHP 7.4.

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Merge branch 'PHP-7.4'

Deprecate (real) cast

Merge branch 'PHP-7.4'

Drop free_filename field from zend_file_handle

free_filename was always zero.

Merge branch 'PHP-7.4'

Introduce zend_stream_init_filename()

Avoid more ad-hoc initialization of zend_file_handle structures.

Merge branch 'PHP-7.4'

Support <?php followed by EOF

This is an annoying edge-case for canonicalization.

Merge branch 'PHP-7.4'