<?php
$arr1 = array(1,3, 5,7,8);
$key = array_search(3, $arr1);
if ($key !== false){
array_splice($arr1, $key, 1);
}
var_dump($arr1);
// array(4) { [0]=> int(1) [1]=> int(5) [2]=> int(7) [3]=> int(8) }
?>
<?php
$arr2 = array(1,3, 5,7,8);
foreach ($arr2 as $key=>$value)
{
if ($value === 3){
unset($arr2[$key]);
}
}
var_dump($arr2);
// array(4) { [0]=> int(1) [2]=> int(5) [3]=> int(7) [4]=> int(8) }
?>