City[0] = "Elghorashi";
State[0] = "";
ZipCode[0] = "";
CCity[0] = "Elghorashi";
CState[0] = "";
CZipCode[0] = "";
City[1] = "Abugibha";
State[1] = "";
ZipCode[1] = "";
CCity[1] = "Abugibha";
CState[1] = "";
CZipCode[1] = "";

$string = 'City[0] = "Elghorashi"; State[0] = ""; ZipCode[0] = ""; CCity[0] = "Elghorashi"; CState[0] = ""; CZipCode[0] = ""; City[1] = "Abugibha"; State[1] = ""; ZipCode[1] = ""; CCity[1] = "Abugibha"; CState[1] = ""; CZipCode[1] = "";';
$string = substr($string, 0, -1);

$arr = explode('; ', $string);
$newArray = [];
foreach($arr AS $value){
    $keyVals = explode(' = ', $value);
    preg_match_all('/^(.*?)[([0-9]+)]$/', $keyVals[0], $matches);
    $value = is_string($keyVals[1]) ? substr($keyVals[1], 1, -1) : $keyVals[1];
    $newArray[$matches[2][0]][$matches[1][0]] = $value;
}