Full Version: Delete from Text File using PHP
I know of methods to create and append to text files using PHP, but is there way to delete specific portions? This is used for keeping a simple list (without using a database). Each "item" is a single string with no spaces, and each item is on it's own line. Any ideas?
Use filegetcontents() to read the file into a string.
Use explode() to get the contents of the file/string into an array (since they're just single items, right?).
Loop through the array to remove what you wanted to remove.
Output the array (using implode()) back to the file.
This is just one way. You can get much more advanced ways of doing things, such as using the Berkeley DB (flatfile) abstraction methods.
Use explode() to get the contents of the file/string into an array (since they're just single items, right?).
Loop through the array to remove what you wanted to remove.
Output the array (using implode()) back to the file.
This is just one way. You can get much more advanced ways of doing things, such as using the Berkeley DB (flatfile) abstraction methods.
QUOTE(malikyte @ Mar 14 2006, 06:04 AM) 
Use filegetcontents() to read the file into a string.
Use explode() to get the contents of the file/string into an array (since they're just single items, right?).
Use explode() to get the contents of the file/string into an array (since they're just single items, right?).
i THINK simple file function can do that? http://www.php.net/file .. Correct me if i'm wrong please
CODE
<?php
// Get a file into an array. In this example we'll go through HTTP to get
// the HTML source of a URL.
$lines = file('http://www.example.com/');
// Loop through our array, show HTML source as HTML source; and line numbers too.
foreach ($lines as $line_num => $line) {
echo "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br />\n";
}
// Another example, let's get a web page into a string. See also file_get_contents().
$html = implode('', file('http://www.example.com/'));
?>
// Get a file into an array. In this example we'll go through HTTP to get
// the HTML source of a URL.
$lines = file('http://www.example.com/');
// Loop through our array, show HTML source as HTML source; and line numbers too.
foreach ($lines as $line_num => $line) {
echo "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br />\n";
}
// Another example, let's get a web page into a string. See also file_get_contents().
$html = implode('', file('http://www.example.com/'));
?>
file() will in fact put things into an array, however the KEY is the line number. If that's a desired effect, and you NEED the line number, then by all means use that. However, filegetcontents() is supposedly the most efficient way to get file contents into a string. So, for speed and efficiency, it just depends on how well explode() works, I suppose.
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