Work
session_start hangs when it used to work
by Adrian on Dec.13, 2011, under Programming, Work, Zend
I had a problem with my zend application hanging with a white screen for no reason.
I narrowed it down to when
1 | $adminSession = new Zend_Session_Namespace('Admin'); |
was executed, this is just a session? so debugging further, confirmed that session_start() hangs when it used to work.
There are lots of explanations for this, but before you start modifying ini settings, just try this
1 2 3 | session_write_close(); session_start(); die(print_r($_SESSION,true)); |
I found this resolved the problem completely.
I then just removed this debug-code and went back to developing my zend app.
database class php
by Adrian on Aug.08, 2011, under Programming, Work
Updated the database class
Usage:
1 2 3 4 5 6 | // min instantiation $dataBase = new DB('hostname','username','password','database'); // max instantiation $dataBase = new DB('hostname','username','password','database',DEBUG_LEVEL,array('admin@domain.com','admin@domain2.com)); |
Class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 | class DB{ /* * DESCRIPTION: Object class, Handles all database requests and returns content accordingly * WRITER: Adrian Callaghan 12,08,08 * UPDATED: Adrian Callaghan 08,08,11 * * * errLvl * (0), none, * (1) show a user error, * (2) (1) + mysql error * (3) (2) + show a full error (mysql errors), * (4) (3) + plus debugging */ private $host, $usr, $pwd, $errLvl, $mySqlHost, $dataBase, $emailAddresses; public function __construct($host, $usr, $pwd, $db, $errLvl=0, $adminEmails=array()) { /* * Sets up a new connection */ // MIN required $this->setHost($host); $this->setUsr($usr); $this->setPwd($pwd); $this->setErrLvl($errLvl); // sets defualt RTE $this->setEmailErrsTo($adminEmails); // connect $this->connect(); $this->setDb($db); } public function __destruct(){ /* * Close the connection */ $this->disconnect(); } protected function setHost($host='localhost'){ /* * Sets the hostname */ $this->host = $host; } protected function setUsr($usr=''){ /* * Sets the username */ $this->usr = $usr; } protected function setPwd($pwd=''){ /* * Sets the password */ $this->pwd = $pwd; } protected function setErrLvl($errLvl=0){ /* * Sets the error reporting level */ $this->errLvl = $errLvl; } protected function connect(){ /* * Connect to server */ $this->mySqlHost = @mysql_connect($this->host, $this->usr, $this->pwd); if (!$this->mySqlHost) { $this->error('Cannot connect to server',mysql_error()); } } protected function disconnect() { /* * closes current connection */ @mysql_close($this->mySqlHost); } public function setDb($db){ /* * Set the database */ $this->dataBase = @mysql_select_db($db,$this->mySqlHost); if (!$this->dataBase) { $this->error('Cannot select database',mysql_error()); } } public function setEmailErrsTo($email = array()){ // ensure it is an array $email = !is_array($email) ? array($email) : $email; // if empty return if (empty($email)){ return; } // assign the email addresses $this->emailAddresses = $email; } function getQuery($SQL){ // executes a query $result = @mysql_query($SQL); if (!$result) { $this->error('Invalid query',mysql_error(),$SQL); } // create a 2D array of results $return = array(); while ($row = mysql_fetch_assoc($result)) $return[] = $row; return $return; } function setQuery($SQL){ // executes a query without returning any results, used for insert, create etc, returns the ID of the last auto-increment $result = @mysql_query($SQL); if (!$result) { $this->error('Invalid query',mysql_error(),$SQL); } $return = mysql_insert_id(); return $return; } public function error($message, $mysqlErr='', $SQL=''){ /* * Handles errors * */ switch ($this->errLvl){ case 0: break; case 1: $mysqlErr=''; // kill the mysql output case 2: $SQL=''; // kill the sql output case 3: case 4: echo "<h1 style='color:#444444;'>$message</h1><hr>"; if ($mysqlErr!=='') { echo "<p><span style='color:#ff0000; font-weight:bold;'>Mysql: </span>$mysqlErr</p>"; } if ($SQL!=='') { echo "<p><span style='color:#ff0000; font-weight:bold;'>Whole query: </span>$SQL</p>"; } } $email = $this->generateEmail(array('Error'=>$message,'Mysql'=>$mysqlErr,'Sql'=>$SQL,'Err Level'=>$this->errLvl)); // three is for debugging if ($this->errLvl>3){ echo $email; } if (!empty($this->emailAddresses)){ $sent = $this->sendEmails($email); if ($sent) echo '<h2>The administrator has been notified</h2>'; else { echo '<h2>Please notify the administrator'; echo count($this->emailAddresses)>1 ? "'s " : " "; echo implode(' or ',$this->emailAddresses); echo '</h2>'; } } exit(); } private function generateEmail($err=array()){ $fields = array( 'Server name'=>$_SERVER['SERVER_NAME'], 'Query'=>$_SERVER['SCRIPT_FILENAME'].'?'.$_SERVER['QUERY_STRING'], 'Ip'=>$_SERVER['REMOTE_ADDR'].':'.$_SERVER['REMOTE_PORT'], '@'=>date("D dS M,Y h:i a") ); $rtn = '<table bgcolor="#cccccc">'; foreach (array_merge($fields, $err) AS $title=>$value){ $rtn.="<tr><td bgcolor='#aaaaaa'>$title</td><td bgcolor='#bbbbbb'>$value</td></tr>"; } return $rtn.'</table>'; } public function sendEmails($reciptents=array()){ // email message $Name = $_SERVER['SERVER_NAME']; //senders name $email = "noreply@".$_SERVER['SERVER_NAME']; //senders e-mail adress $subject = $_SERVER['SERVER_NAME']." Error"; //subject $header = 'MIME-Version: 1.0' . "\r\n"; $header.= 'Content-type: text/html; charset=iso-8859-1' . "\r\n"; $header.= "From: ". $Name . " <" . $email . ">\r\n"; $success=false; foreach ($this->emailAddresses AS $admin_email){ $sent = @mail($admin_email, $subject, $mail_body, $header); if ($sent) $success=true; // holds state for any email being succesfully sent } return $success; } } |
compile your own lamp stack with mysqli
by Adrian on Jun.16, 2011, under Programming, Work
Install LAMP with one line
One liner
sudo apt-get install lamp-server^
Add CURL and enable mod-rewrite
sudo apt-get install php5-curl sudo a2enmod rewrite
To compile LAMP with mysqli and mysql
Assuming you have a fresh clean minimal install of ubuntu start by install gcc and wget
sudo apt-get gcc sudo apt-get wget
Download apache and php and use filezilla or a similar SFTP client to upload them to the server (I was unable to find a direct link that didnt pass through a mirror), once uploaded move to the directory on the cmd line.
unpack apache
1 2 | gzip -d httpd-2_x_NN.tar.gz tar -xf httpd-2_x_NN.tar |
unpack PHP
1 2 | gzip -d php-NN.tar.gz tar -xf php-NN.tar |
Compile and install Apache
1 2 3 4 | cd httpd-2_x_NN ./configure --enable-so make sudo make install |
Compile PHP
1 2 | cd ../php-NN ./configure --with-aspxs2=/usr/local/apache2/bin/apxs --with-mysql=/usr/bin/mysql_config --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd |
This will fail with an error “error locating libxml2″ fix this with:
sudo apt-get install libxml2
Next the error below will appear
xml2 config not found Please check your libxml2 installation
Point your browser or ftp client at ftp://xmlsoft.org/libxml2/ and take note of the latest version for libxml2-2.6.28 and then grab it and install it from the server
1 2 3 4 5 6 | sudo wget ftp://xmlsoft.org/libxml2/libxml2-2.X.XX.tar.gz sudo tar -zxvf libxml2-2.X.XX.tar.gz cd libxml2-2.X.XX/ ./configure make sudo make install |
Try to compile PHP again:
1 | ./configure --with-aspxs2=/usr/local/apache2/bin/apxs --with-mysql=/usr/bin/mysql_config --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd |
next problem is Mysql
configure: error: Cannot find MySQL header files under /usr/bin/mysql_config
To fix this, Install mysql:
sudo apt-get install mysql-server
But now even though Mysql is found there are still no headers so first install php module for mysql:
sudo apt-get install php5-mysql
and add the header library
sudo apt-get install libmysqlclient15-dev
Now PHP should compile and install fine:
1 2 3 | ./configure --with-aspxs2=/usr/local/apache2/bin/apxs --with-mysql=/usr/bin/mysql_config --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd make make install |
Set up an ini file for PHP:
sudo cp php.ini-development /usr/local/lib/php.ini
tell apache to load the module:
LoadModule php5_module modules/libphp5.soYou need to re/start apache
/usr/local/apache2/bin/apachectl start
personally I like to restart the entire server with changes this big
shutdown now -rThats it!
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