<h2 id="substr">substr</h2>
<h2 id="sprintf">sprintf</h2>
<h2 id="inarray">in_array</h2>
<h2 id="isarray">is_array</h2>
<h2 id="strpos">strpos</h2>
<h2 id="printf">printf</h2>
<h2 id="define">define</h2>
<h2 id="strreplace">str_replace</h2>
<h2 id="trim">trim</h2>
<h2 id="count">count</h2>
<h2 id="strlen">strlen</h2>
<h2 id="pregmatch">preg_match</h2>
<h2 id="defined">defined</h2>
<h2 id="functionexists">function_exists</h2>
<h2 id="implode">implode</h2>
<h2 id="pregreplace">preg_replace</h2>
<h2 id="explode">explode</h2>
<h2 id="arraymerge">array_merge</h2>
<h2 id="arraykeys">array_keys</h2>
<h2 id="isstring">is_string</h2>


## substr	
## sprintf	
## in_array	
## is_array	
## strpos	
## printf	
## define	
## str_replace
## trim	
## count
## strlen	
## preg_match	
## defined	
## function_exists	
## implode	
## preg_replace	
## explode	
## array_merge	
##  array_keys	
## is_string

Top 20 PHP function

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