PHP - MySQL

Discuss coding issues, and scripts related to PHP and MySQL.

  1. » Marius
    Hi,
    I have this php exercise:
    - Calculate the final sum of the digits of a number, till get a number with one digit.
    For example:
    $nr = 458;
    //...
    Last post » sandy
    Another example with a recursive function:
    <?php
    function add($nr) {
      $nr = array_sum(str_split($nr));
      if(strlen($nr) == 1) return $nr;...


  2. » PloMar
    Hello,
    I have the following method to update data in MySQL table.
    public function update($table, $rows){
      foreach($rows as $k => $v) {...
    Last post » Admin
    Hi,
    Try this code:
    public function update($table, $rows){
      $set = [];
      foreach($rows as $k => $v) {
        $set[] =  $k='$v' ;
      }
      $sql = ...


  3. » Marius
    Hi
    I have a table in mysql database, with 3 columns: id | title | description .
    The id column is INT AUTO_INCREMENT .
    Does anyone know how to...
    Last post » sandy
    Hi,
    If you're using PDO, use PDO::lastInsertId();// To Display the last Inserted value
    If you're using MySql, use mysql_insert_id();// To Display...


  4. » PloMar
    Hi,
    I have the following code that uses DOMDocument to get some data from a html string in PHP.
    // string with HTML content...
    Last post » MarPlo
    Hi,
    The nodeValue attribute gives you the combined text of all the child nodes.
    To get the text value of the first child text node only, use:...


  5. » PloMar
    I wrote a PHP code to insert some data in to MySQL database. I want to display a message indicating whether the records are successfully added to the...
    Last post » sandy
    try {
          $db_user = 'root';
              $db_pass = 'pass'; 
              $db = new PDO( 'mysql:host=localhost;dbname=the_db', $db_user, $db_pass );...


  6. » PloMar
    Hello,
    I have the following code that saves on the server a png image generated with php.
    In that image I add a text (using imagettftext()), but...
    Last post » MarPlo
    Hi,
    You can use the imagettfbbox() function, it returns an array with 8 elements representing four points making the bounding box of the text....


  7. » PloMar
    Hello,
    How can I save the content of the current php page into a html file, only after a form is submitted?
    For example, I have the following code...
    Last post » MarPlo
    If you want to save the page content after a form is submitted, another way is to add the page code into a hidden field in that form, with JavaScript...


  8. » PloMar
    I have the following Select in MySQL:
    $sql = SELECT * FROM table_1 WHERE rank = 2 AND id IN(2, 5, 8) ;
    But the IDs (2, 5, 8, ...) must be from a...
    Last post » MarPlo
    You can use multiple Select statements in the same SQL query.
    Try this query, using a sub-select that selects the IDs.
    $sql = SELECT * FROM table_1...


  9. » PloMar
    I have two text fields, one for the date in 08/21/2012 format and a second field containing the time in the format 09:41am .
    How can I end up...
    Last post » MarPlo
    On the database side, you can use:
    - STR_TO_DATE() to convert into a database friendly format.
    SELECT STR_TO_DATE(CONCAT('08/21/2012', '09:41am'),...


  10. » PloMar
    I want to insert a DateTime object in database (created in PHP) where the column type is DateTime. How can I do?
    I am using this code:
    $cdate = new...
    Last post » MarPlo
    Use the Y-m-d H:i:s date-time format in PHP, it is the format of the DateTime column in MySQL.
    $cdate = new DateTime('now');...


  11. » PloMar
    Hello
    How can I replace the new lines with a single space in a string in PHP?
    For example I have this $str variable with a string content with...
    Last post » Admin
    You can use str_replace() with PHP_EOL.
    Example:
    $str = 'First line
    Second row
    Other line ...';
    $str = str_replace(PHP_EOL, ' ', $str);
    echo $str; ...


  12. » PloMar
    What's the best way to delete a directory with all its files in it?
    I'm using rmdir(PATH . '/' . $value); to delete a folder, however, if there are...
    Last post » Admin
    This function will allow you to delete any folder (as long as it's writable) and it's files and subdirectories:
    function deleteDir($path) {...


  13. » PloMar
    I try to parse a JSON file using PHP. The data in this JSON is in a two-dimensional object, like this:
    {
    John : {
    status : Wait
    },
    Jennifer :...
    Last post » Admin
    To iterate over a multidimensional array, you can use RecursiveArrayIterator.
    $string = file_get_contents('/dir/test.json');...


  14. » MarPlo
    How can I detect which request type was used (GET, POST, PUT or DELETE) in a php script?
    Last post » Admin
    Simple use $_SERVER .
    $request = $_SERVER ;
    echo $request;

    if($request === 'GET') {
      // ...
    }
    else if($request === 'POST') {
      // ...
    }...


  15. » MarPlo
    I have a PHP array as follows:
    $aray = array(312, 'string', 1599, 'other val');
    $del_val = 1599; 
    I want to delete the element containing the value...
    Last post » Admin
    You can use array_search() and unset(), like in this example:
    $aray = array(312, 'string', 1599, 'other val');
    $del_val = 1599;...


  16. » MarPlo
    What is the best way to validate an email address in PHP?
    I currently use preg_match() with a RegExp:
    $email = 'some_name@domain.com';...
    Last post » Admin
    The easiest and safest way to check whether an email address is well-formed is to use the filter_var() function:
    $email = 'some_name@domain.com';...


  17. » MarPlo
    I am trying to select all rows from a table where column contains a character from a list: Something like:
    SELECT * FROM table WHERE column...
    Last post » Admin
    Try with REGEXP, and escape everything with backslash. Result: .
    SQL:
    SELECT * FROM table WHERE column REGEXP ' '


  18. » MarPlo
    I want to search in mysql database with columns containing some specified names and the column has values like:
    Varsus GmbH (default)
    Varsus...
    Last post » Admin
    Try this Select:
    SELECT * FROM table WHERE
    suppliername = 'Varsus'
    OR (
    suppliername LIKE '%Varsus%'
    AND suppliername LIKE '%default%'
    )
    - The...


  19. » MarPlo
    In login.php it is set a session ID for the logged user. Something simple:
    <?php
    session_start();

    // check login data received from a form .....
    Last post » Admin
    Store a timestamp in the session.
    In login.php , register a session with the expired timestamp (when you want to expire that session) in the same...


  20. » MarPlo
    Hello,
    I have two array one is 1 to 8 number of cards and four colors of cards.
    $no = array(1, 2, 3, 4, 5, 6, 7, 8);...
    Last post » Admin
    Hi,
    Use nested foreach() loops:
    $no = array(1, 2, 3, 4, 5, 6, 7, 8);
    $color = array('K','L','F','C');
    $result = array();
    foreach ($no as $n) {...


  21. » Marius
    I am trying to write a Regular Expression that makes sure the characters are all Alpha Numeric, and that accepts other characters as well. I would...
    Last post » MarPlo
    Hi,
    Your regex ^ *$ won't match the accented characters. That is \w would match only the English alphabets, digits 0-9 plus the underscore symbol....


  22. » Marius
    I facing a problem about a select query in MySQL.
    I have table user, It contains id_user, username and user_time. And user_time is a Date-Time for...
    Last post » Admin
    Hi,
    YEAR returns a number like 2015. That will never be equal to a time. You need to test whether the year of user_time is the same as the given...


  23. » Marius
    I have a table with the following columns: id | url | title | company .
    Now, I need to delete rows having same url and title.
    I want to know if...
    Last post » Admin
    An easy way to do this is to add a UNIQUE index on the columns with duplicate values, using the ALTER statement.
    When you write the ALTER statement,...


  24. » Marius
    I have SQL a query like this:
    SELECT c.type, SUM( u.account )
    FROM contracts c, u_data u
    WHERE c.user_id = u.id
    GROUP BY c.type;
    Now this gives me...
    Last post » Admin
    Hi,
    You just have the wrong order for GROUP BY and ORDER BY.
    ORDER BY should be added after GROUP BY.
    ...
    GROUP BY c.type;
    ORDER BY FIELD( c.type,...


  25. » Marius
    Hi
    I have an array in php:
    $arr = array(3, 'value 1', 'other value');
    And a mysql table with these columns: id | name | data
    I want to store...
    Last post » Admin
    Hi
    You can store an array in a database into a string with JSON format.
    Use json_encode() when you want to insert the array. For example:...