PHP tutorial-String Manipulation: find and replace
String manipulation in PHP
find and replace functions
The strpos(String, String_to_find) function returns the position of the String_to_find in the String. The str_replace(Old_string,New_string,String) function is used to replace the Old_string with the New_string. In the example below, we create a simple find-and-replace word program that allows a user to find and replace words in a textarea box.
Example:
<html>
<head>
<title>Find and Replace<title>
<?php
$str1=$_GET['txtmessage'];
global $strnew;
$str_to_find=$_GET['txtfind'];
$str_to_replace=$_GET['txtreplace'];
$pos=strpos($str1,$str_to_find);//find the word to replace
if($pos>=0)//The word is found. Then make replacement.
$strnew=str_replace($str_to_find,$str_to_replace,$str1);
?>
</head>
<body>
<form action="welcome.php" method="get">
<table>
<tr>
<?php
//assign the new string to the textarea
echo "<td><textarea name='txtmessage' rows='18' cols='100'>$strnew</textarea></td>";
?>
</tr></table>
<table>
<tr>
<td align='left'>Find what:</td><td align='left'> <input type="text" name="txtfind"
></td>
</tr>
<tr>
<td align='left'>Replace with: </td><td align='left'><input type="text"
name="txtreplace" ></td>
<td><input type="submit" name="sub" value="submit"></td>
</tr>
</table>
</form>
</body>
</html>
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