php使用替换字符串函数的方法: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。

php使用替换字符串函数的方法:

PHP字符串替换str_replace()函数4种用法,具体内容如下所示:

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)

<?php
  //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
?>
<?php
  //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);
?>
<?php
  //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);
?>
<?php
  //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);
?>

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