<?php
Top Most important Php function
1. empty(); // return true false
$p='val';
if(!empty(
$p)){ // if $p is not empty
echo 'variable is not empty ';
} else {
echo 'value is null';
}
2. unset();
use for
unse session or variable values
unset($a);
3. isset();
if(isset(
$a)){
echo
'value is set ';
} else {
echo 'value is not set ';
}
4. trim()
use for
removes the whitespaces from the left part of the string.
trim($a);
5. explode () ;
convert strin to array
$str = "Rajeev Dhar dwivedi"; $array = explode(" ",$str); print_r($array);
outPut :
Array ( [
0] => Rajeev [1] => Dhar [2] => dwivedi )
6. implode(); convert array to string
$array
= array( 'Rajeev' ,'Dhar','Dwived') ;
echo
implode(" ",$array);
Output : Rajeev Dhar Dwived
7. date
() function
this function use fot get date from system
echo date('Y-M-d');
8. time()
this function use for get time from system in mili second
echo time();
9. most important php function
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