Answers for "why array item chaged in unset function in php"

php unset array element

//Delete array items with unset(no re-index) or array_splice(re-index)
$colors = array("red","blue","green");                             
unset($colors[1]);//remove second element, do not re-index array

$colors = array("red","blue","green");
array_splice($colors, 1, 1); //remove second element, re-index array

How To Unset Or Delete An Element From Array By Value In PHP?

if (($key = array_search($value, $sampleArray)) !== false) {
    unset($sampleArray[$key]);
}