Added word_count() function that allows counting of words inside a string.
The function also allows the user to retrieve all the words from a string.

Fixed problems with the new nl2br() and beautified the code a little.
Closes #19858.

Switched from localeconv to localeconv_r, which is apparently thread-safe.

ws fixes

This patch fixes handling of floats on locales where decimal point is not a
'.'. Problem is best demonstrated by bug #17079.

ws fixes.

Optimizations to various php string functions substr_count(), strrev(),
nl2br(), php_addslashes() and php_memnstr().

Returning to the old behavior of str_shuffle() a bit. Now the passed string is
left unmodified and the shuffled string is returned.

Now str_shuffle() has the randomization characteristics of shuffle().
str_shuffle() won't return anymore the randomized string and thus will be
consistent with shuffle(). Since this function

Now str_shuffle() has the randomization characteristics of shuffle().
str_shuffle() won't return anymore the randomized string and thus will be
consistent with shuffle(). Since this function is new to 4.3.0 no BC
problems.
#Thanks to Adam Trachtenberg for providing good example to check the
#permuations distribution.

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Fix another leak in implode()

Fixed segfault and memory leak in the new implementation of implode()

have implode use the smart_str_*() functions, this should speed things up
quite a bit...

Fixed a bug in the new implementation of str_repeat()

- dot :)

fix a memory leak in implode()

# kept seperate from last commit on purpose.. ;)

@ Make the glue argument to implode() optional, if it is not specified
@ default to using "". (Sterling)

ws fixes.
#again :)

Optimized str_repeat() function, it is now 10x faster on 1 byte multipliers
and 5-6x faster on multi-byte multipliers.

Forgot 1 byte for \0

Save memory

Making strrchr() binary safe.
Test case added.

Making strstr() binary safe.

Ws fix. Forgot to add this in the previous commit.

ws fixes.

Fix warning.