Fix print_r return types in opcache

https://www.php.net/print_r

> When the return parameter is TRUE, this function will return a string.
> Otherwise, the return value is TRUE.

Fixed bug #78747

Fix opcache return type for get_headers in zend_func_info

https://www.php.net/manual/en/function.get-headers.php#refsect1-function.get-headers-examples
shows that it will return string k

Fix opcache return type for get_headers in zend_func_info

https://www.php.net/manual/en/function.get-headers.php#refsect1-function.get-headers-examples
shows that it will return string keys when the second argument is
non-zero. I've verified that this is the case.

This bug was there since the initial commit in c88ffa9a567.

Closes GH-4702.

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Fix opcache return type for hash_update_stream

It can return false if the resource type is wrong.

```
php > var_export(hash_update_stream(hash_init('md5'),
imagecrea

Fix opcache return type for hash_update_stream

It can return false if the resource type is wrong.

```
php > var_export(hash_update_stream(hash_init('md5'),
imagecreate(1,1)));

Warning: hash_update_stream(): supplied resource is not a valid stream
resource in php shell code on line 1
false
```

The return types were initially added in
c88ffa9a5673cb3141660626ba1921671f0b84d6

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Also fix signature for passthru

Backported from a1a8d144854acb1c891cf0c21abb0f612b1d8de7
https://www.php.net/manual/en/function.passthru.php#refsect1-function.passthru-returnvalues

Also fix signature for passthru

Backported from a1a8d144854acb1c891cf0c21abb0f612b1d8de7
https://www.php.net/manual/en/function.passthru.php#refsect1-function.passthru-returnvalues

`passthru()` is false with invalid args
`passthru('command')` is null.

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Fix opcache optimizer info for time_nanosleep

This can also return an array. See
https://www.php.net/manual/en/function.time-nanosleep.php#refsect1-function.time-nanosleep-returnvalues

Fix opcache optimizer info for time_nanosleep

This can also return an array. See
https://www.php.net/manual/en/function.time-nanosleep.php#refsect1-function.time-nanosleep-returnvalues

> If the delay was interrupted by a signal, an associative array will be
returned with the components:
>
> - seconds - number of seconds remaining in the delay
> - nanoseconds - number of nanoseconds remaining in the delay

Sending a SIGUSR1 to the below program would trigger this behavior.

```
pcntl_signal(\SIGUSR1, function ($signo, $signinfo) {
echo "Handling a signal $signo\n";
});
echo "Sleeping for 100 seconds\n";
var_export(time_nanosleep(100, 0));
```

The incomplete signature existed since c88ffa9a5.
No phpt tests existed for time_nanosleep returning an array

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Be more precise about possible types for mysqli methods

mysqli has an uncommon approach to 64-bit compatibility:
it will convert numbers that can't be represented on 32-bit
platforms

Be more precise about possible types for mysqli methods

mysqli has an uncommon approach to 64-bit compatibility:
it will convert numbers that can't be represented on 32-bit
platforms to a string.
This is documented at
https://www.php.net/manual/en/mysqli-stmt.affected-rows.php#refsect1-mysqli-stmt.affected-rows-returnvalues

So if there's a query to a remote mysqli server that affects
more than 2.2 billion rows, then the opcache inference might be
incorrect.

(It's possible to add a MAY_BE_STRING_ON_32_BIT_PLATFORM bitflag macro to
account for this, but I don't think there's a need or want to?)

Patches 3162285b86871fb22a85a50ce9bc30823da64b6a

This is based on the list of php 7.4 functions using
MYSQLI_RETURN_LONG_INT in mysqli_api.c

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Fix opcache signatures for mysqli_stat

See mysqli_api.c and https://www.php.net/manual/en/mysqli.stat.php

Fix bug in opcache flags for mysqli_get_charset

https://www.php.net/manual/en/mysqli.get-charset.php
tests/mysqli_field_seek.phpt has a test of this returning an object.

Looking

Fix bug in opcache flags for mysqli_get_charset

https://www.php.net/manual/en/mysqli.get-charset.php
tests/mysqli_field_seek.phpt has a test of this returning an object.

Looking at the source in ext/mysqli/mysqli_nonapi.c,
this should be object|null, not array|null

This might actually cause bugs in opcache's inferences,
(no proof of this)
so it might make sense to pull this patch into an earlier minor version.

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Func info: Fix calls to zero-arg varargs

The num_args does not include variadics, so a "zero-arg" function
may accept additional arguments through that. No functions seem
to be affec

Func info: Fix calls to zero-arg varargs

The num_args does not include variadics, so a "zero-arg" function
may accept additional arguments through that. No functions seem
to be affected right now, but they will be after #4175.

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Future-proof email addresses

Remove assertion

Fixed bug #76477 (Opcache causes empty return value)

Use zend_string_release_ex() instread of zend_string_release() in places, where we sure about string persistence.

Add is_countable function

RFC: https://wiki.php.net/rfc/is-countable

Fix pfsockopen() func info

Fix constant() func info

Since PHP 5.6 this can also be an array.

Fix pg_pconnect() func info

Fix gettext func infos

More mysqli func info fixes

Mainly changing resource returns to objects

Fix lcfirst() + ucfirst() func info

These may return the original string

Fix bcpowmod() func_info

Returns false on error

Fix error_get_last() func info

Fix mysqli_connect() func info

This function returns an object, not a resource...

Fix bcscale() function info

Master only: This function now returns the old scale.