php中替换字符串的实现方法

php中替换字符串的实现方法：首先创建一个PHP示例文件；然后通过“str_replace("red","black","red green yellow pink purple");”方法替换字符串；最后通过echo输出替换结果即可。

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• 该方法适用于所有品牌电脑。

PHP字符串替换str_replace()函数四种用法

参数 $search,要替换的字符串，或数组

参数 $replace,被用来替换的字符串或数组

参数 $subject,被查询的字符串或数组

参数 $count，可选，如果被指定，将为设置为替换的次数

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);