Torben at 20:27, 30 October 2024

2024-10-30T20:27:02Z

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[[Category:Coding]]
==Basics==
PHP Variables
$DOCUMENT_ROOT
$PHP_SELF
$_GET['url_param']
$_POST['form_param']
$my_param = htmlentities($_POST['form_param']);

Check variables
is_numeric()
is_file()
is_dir()

===Strings===
Usefull stuff
strtolower
strtoupper
trim // trims spaces at the ends of string
nl2br // \n -> <br>

// Search in string
ereg[i](was,wo); // i: case insensitive
// Replace chars
ereg[i]_replace (was,womit,wo); // i: case insensitive
str_replace(was,womit,wo); // case sensitive, works on arrays as well
// Pos of substring
strpos ($file_name,"."[,startint]); // start from left
strrpos($file_name,"."[,startint]); // start from right

// Part of string
$ext = strrchr($file_name,"."); // start from right and take all up to the end
$filename = str[i]str($file_name,"."); // start from left, i: case insensitive
// Return a substring
substr($string, pos [, number]); // pos can be negative

Work on special chars
stripslashes // removes \
addslashes // adds \ to " \ NULL
quotemeta // adds \ to . \\ + * ? [ ] ^ ( ) $
htmlentities // converts into HTML chars
// Umlaute: utf8 -> htmlcode
$text = htmlentities(utf8_decode($text));

===Arrays===
Split string to array
explode(" und ",$str);
split[i](" UnD ",$Str); // i: case insensitive
Array to string
implode(", ",$moin);

Sort
sort($array);
natsort($array); // 2 before 10

Remove items
unset($array[$x]);
// nicer:
$raus = array();
$raus[] = $array[$x];
$array = array_diff($array,$raus);

while (($id = array_search($what,$where))>-1)
unset ($files[$id]);

Remove duplicates
$a = array_values(array_unique($a));

Compare arrays
$c = array_diff ($a, $b);
$c = array_intersect ($a, $b);
$c = array_merge ($a, $b);

Print a hash
foreach ($array as $key=>$val)
echo "key = $key, val = $val";

==Regular Expressions==
Special chars
. = 1 char
.? = 0,1 chars
.* = 0-oo chars
.+ = 1-oo chars

\s = whitespace
\S = no whitespace
\w = word char (=a-z,0-9,_)
\W = no word char
\d = decimal number
\D = no decimal number
\b = word boundary
\B = no word boundary
\n = new line (Linux)
\r = CR (Windows: \n\r)

Options
i = case insensitive
e = execute php code inside expression
s = single string, (search passes lineends)
U = ungreegy

Search
eregi('EXPRESSION', $string)
preg_match("'EXPRESSION'is", $where, $results);
preg_match_all("'EXPRESSION'is", $where, $results);
$result1 = $results[1];
//Check eMail-Syntax

Replace
preg_replace($patterns, $replacements, $where);
preg_replace("'<title>[^<]*</title>'is","",$htmlinhalt);

$was = array();
$womit = array();
..
$text = preg_replace($was,$womit,$text);

==Other Stuff==
$date = date("Y-m-d"); // Date to mysql format

===Run External Command===
exec("command"); //waits until command is finnished
exec("command >/dev/null 2>&1"); // ignores output, so php continues right away

===Images===
Read Image Size
$array = getimagesize($file);

===Char Encoding===
[http://htmlpurifier.org/docs/enduser-utf8.html]
The simplest way to handle this problem is to send the encoding yourself, via your programming language. The appropriate code is:
header('Content-Type:text/html; charset=UTF-8');
This code must come before any output, so be careful about stray whitespace in your application (i.e., any whitespace before output excluding whitespace within <?php ?> tags).

Encode spaces etc from a string for usage as url-paramter:
$file = rawurlencode ($file);
$file = rawurldecode ($file);

==Functions==
function delTree($dir) {
$files = glob( $dir . '*', GLOB_MARK );
foreach( $files as $file ){
if( is_dir( $file ) )
delTree( $file );
else
unlink( $file );
}
if (is_dir($dir)) rmdir( $dir );
}

function recurse_chown_chgrp($mypath, $uid, $gid) {
$d = opendir ($mypath) ;
while(($file = readdir($d)) !== false) {
if ($file != "." && $file != "..") {
$typepath = $mypath . "/" . $file ;
if (filetype ($typepath) == 'dir') {
recurse_chown_chgrp ($typepath, $uid, $gid); }
chown($typepath, $uid);
chgrp($typepath, $gid);
} } }

function recurse_chmod($mypath, $mod) {
$d = opendir ($mypath) ;
while(($file = readdir($d)) !== false) {
if ($file != "." && $file != "..") {
$typepath = $mypath . "/" . $file ;
if (filetype ($typepath) == 'dir') {
recurse_chmod ($typepath, $mod); }
chmod($typepath, $mod);
} } }

==Login==
function auth()
{
header('WWW-authenticate: basic realm="Name of realm"');
header('HTTP/1.0 401 Unauthorized');
exit("text...");
}

// username / passwd in $PHP_AUTH_USER / $PHP_AUTH_PW
if(!isset($PHP_AUTH_USER))
auth();
else {
// check if $PHP_AUTH_USER / $PHP_AUTH_PW are fine. If not run auth()
}

PHP - Revision history

Torben at 20:27, 30 October 2024