php中的str replace PHP字符串替换str_replace()函数4种用法详解

mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )

该函数返回一个字符串或者数组。该字符串或数组是将subject中全部的search都被replace替换之后的结果。

1、$search,要替换的字符串，或数组

2、$replace,被用来替换的字符串或数组

3、$subject,被查询的字符串或数组

4、$count，可选，如果被指定，将为设置为替换的次数

5、返回值：该函数返回替换后的数组或者字符串(新生成的)

//实例一：字符串替换字符串

$str1 = str_replace("red","black","red green yellow pink purple");

echo $str1.""; //输出结果为black green yellow pink purple

?>

//实例二：字符串替换数组键值

$arr = array("blue","red","green","yellow");

$str1 = str_replace("red","pink",$arr,$i);

print_r($str1);

?>

//实例三：数组替换数组，映射替换

$arr1 = array("banana","orange");

$arr2 = array("pitaya","tomato");

$con_arr = array("apple","orange","banana","grape");

$con_rep = str_replace($arr1,$arr2,$con_arr,$count);

print_r($con_rep);

?>

//实例四：如$search为数组，$replace为字符串时

$search = array("banana","grape");

$replace = "tomato";

$arr = array("banana","apple","orange","grape");

$new_arr = str_replace($search,$replace,$arr,$count);

print_r($new_arr);

?>