Sounds a little dizzy? ! ! Use php to operate php pages. There is a small use. In a system, there may be individual small items that are inconvenient to be stored in the database, but we often call them in other pages and need to be updated, so we can solve it in this way. I encountered several small problems, which took me half a day to solve.
For example: the user needs to change a certain title, but it is obviously inappropriate to create a table for this title alone. So I thought of writing this variable into the php file for call by other pages. name.php file, the required content is as follows:
<?
$name="title";
?>
The two words "title" need to be updated by the user. So how do we implement it:
a simple submission information page add_name.php
<form action="addname.php" method="post">
<input type="text" name="name" size="20" />
<input type="submit" value="Submit" />
A page that receives user submitted information and processes it addname.php
<?
$name=$_POST['name']; //Receive the name value passed from add_name.php
if(empty($name)){ //Determine whether it is empty
?>
<script language='javascript'>
alert("Name cannot be empty!");
document.location='add_name.php';
</script>
<?
}else{
$filename="name.php"; //Define operation file
$delline=2; //Number of rows to be deleted
if(!file_exists($filename)){ //Determine whether the file exists
die("The specified file was not found! Operation interrupted!");
}
$farray=file($filename); //Read file data into array
for($tmpa=0;$tmpa<count($farray);$tmpa++){
if(($tmpa+1)==2){ //Judge the number of lines
$farray[$tmpa]="$name2=".""".$name."";n"; *
//Replace the data of the original row
} //Rearranged data
$newfp.=$farray[$tmpa];
}
$fp=@fopen($filename,"w ") or die("Failed to open file $filename in writing mode");
//We open the file in writing mode
@fwrite($fp,$newfp) or die("File Writing failed");
@fclose($fp); Close the file
}
?>
This code is only used for testing 117-202 1Z0-043 1z0-042. The irregularities in writing are quite amusing!
This way we can use it to update the variables in the name.php file. Of course, this is a relatively stupid method (who told me that I am also a stupid person). There are many ways to realize this requirement.
In the line marked with *, we use escape characters. This is very simple to say, but when I tested it, I wasted a lot of time due to improper methods. Now paste the escape character table below:
Escape character sequence meanings
n Line feed (LF or ASCII character 0x0A (10))
r Carriage return (CR or ASCII character 0x0D (13))
t horizontal tab character (HT or ASCII character 0x09 (9))
\ backslash
$ dollar sign
" double quote
[0-7]{1,3} This regular expression sequence matches a character represented in octal notation
x[0-9A-Fa-f]{1,2} This regular expression sequence matches a character represented in hexadecimal notation
For string processing alone, using single quotes is faster than using double quotes, so you need to choose appropriate quotes in your program.