Description:
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The Documentation Page of Arrays contains an error in it's markup. 
Looks like there is an element making text italic is not closed 
appropriatly. 

Reproduce code:
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1.) Visit the page http://php.net/manual/en/language.types.array.php
2.) Search within text for "If $arr doesn't exist"
3.) Take a look at the first match

Expected result:
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after "$arr" text shouldn't be italic any longer.

Actual result:
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Italic isn't stopped until the end of the page.