配列内で特定の値を検索した後、それを置き換えるにはどうすればよいでしょうか?

$fruit = "banana";   $fruits = array("apple","banana","orange");   if( in_array($fruit,$fruits) ) {       //符合条件       //如何把$fruits的"banana"改成"pear"?}

$fruit = "banana";   $fruits = array("apple","banana","orange");   if( in_array($fruit,$fruits) ) {  $fruits[array_search($fruit, $fruits)] = "pear";}print_r($fruits);

Array(    [0] => apple    [1] => pear    [2] => orange)

$fruit = "banana";   $fruits = array("apple","banana","orange");   if(false !== ($t = array_search($fruit, $fruits)) ) {  $fruits[$t] = "pear";}print_r($fruits);