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Where Are Session Values Stored in PHP
Where Are Session Values Stored in PHP? When a value is saved into the current session by one PHP page, the PHP engine must store this value somewhere on Web server, so that the PHP engine can retrieve it back when same visitor comes back to request another PHP page. Where are the session values sto... 2016-10-25, ∼2168🔥, 0💬

Expected Input Field Not Submitted in PHP
What Happens If an Expected Input Field Was Not Submitted in PHP? Obviously, if an expected input field was not submitted, there will be no entry in the $_REQUEST array for that field. You may get an execution error, if you are not checking the existence of the expected entries in $_REQUEST. For exa... 2016-11-15, ∼2161🔥, 0💬

FORM Tag for Uploading Files in PHP
How To Write the FORM Tag Correctly for Uploading Files in PHP? When users clicks the submit button, files specified in the &lt;INPUT TYPE=FILE...&gt; will be transferred from the browser to the Web server. This transferring (uploading) process is controlled by a properly written &lt;FOR... 2016-10-17, ∼2157🔥, 0💬

Generating a Form in PHP
How To Generate a Form in PHP? Generating a form seems to be easy. You can use PHP output statements to generate the required &lt;FORM&gt; tag and other input tags. But you should consider to organized your input fields in a table to make your form looks good on the screen. The PHP script be... 2016-11-17, ∼2133🔥, 0💬

Specifying Input Values for Radio Buttons in PHP
How To Specify Input Values for Radio Buttons in PHP? Radio buttons can be used in a form for two situations: As a single switch - One &lt;INPUT TYPE=RADIO ...&gt; tag, with no input value specified. When submitted with button pushed down, you will receive a value of "on". When submitted wit... 2016-11-13, ∼2127🔥, 0💬

Closing a Session Properly in PHP
How To Close a Session Properly in PHP? Let's say you site requires users to login. When a logged in user clicks the logout button, you need to close the session associated with this user properly in 3 steps: Remove all session values with $_SESSION = array(). Remove the session ID cookie with the s... 2016-10-22, ∼2113🔥, 0💬

Removing Values Saved in the Session in PHP
How To Remove Values Saved in the Current Session in PHP? If you want to remove values saved in the current session, you should use the unset() function on those saved values in $_SESSION, or use array() to empty $_SESSION: unset($_SESSION['MyColor']) - Removes one value named MyColor in the current... 2016-10-24, ∼2108🔥, 0💬

Verifying If a Key Exists in an Array in PHP
How Do You Know If a Key Is Defined in an Array in PHP? There are two functions can be used to test if a key is defined in an array or not: array_key_exists($key, $array) - Returns true if the $key is defined in $array. isset($array[$key]) - Returns true if the $key is defined in $array. Here is a P... 2017-01-29, ∼2100🔥, 0💬

Retrieving the Original Query String in PHP
How To Retrieve the Original Query String in PHP? If you have coded some values in the URL without using the standard form GET format, you need to retrieve those values in the original query string in $_SERVER['QUERY_STRING']. The script below is an enhanced version of processing_forms.php which pri... 2016-11-05, ∼2092🔥, 0💬

Timeout Period on Session Values in PHP
What Is the Timeout Period on Session Values in PHP? The PHP engine has no direct settings on session timeout period. But it has a session garbage collection mechanism that you can set to remove those special files containing session values. There are 3 settings you can use to define the session gar... 2016-10-25, ∼2079🔥, 0💬

Sending a Cookie to the Browser in PHP
How To Send a Cookie to the Browser in PHP? If you want to sent a cookie to the browser when it comes to request your PHP page, you can use the setcookie( ) function. Note that you should call setcookie() function before any output statements. The following script shows you how to set cookies: &... 2016-11-04, ∼2074🔥, 0💬

Retrieving Input Values from Checkboxes in PHP
How To Retrieve Input Values for Checkboxes Properly in PHP? If multiple input values are submitted with the same field name, like the case of a group of checkboxes, you should add ([]) to the end of the field name. This tells the PHP engine that multiple values are expected for this field. The engi... 2016-11-13, ∼2071🔥, 0💬

Deleting Cookie Files in PHP
How To Delete Cookie Files on Your Computer in PHP? A simple way to delete cookie files on your computer is to use the function offered by the IE browser. The following tutorial exercise shows you how to delete cookie files created by IE: Open IE (Internet Explorer) Go to Options/Internet Options Cl... 2016-11-02, ∼2068🔥, 0💬

Determining If a Session Is New in PHP
How To Determine If a Session Is New in PHP? There is not direct way to tell if a session is new or old. But you can design your site to have a required session value in all sessions. Then you can check the existence of this value in a session to determine if it is a new session by isset($_SESSION['... 2016-10-24, ∼2057🔥, 0💬

Detecting File Uploading Errors in PHP
How To Detect File Uploading Errors in PHP? If there was a problem for a file upload request specified by the &lt;INPUT TYPE=FILE NAME=fieldName...&gt; tag, an error code will be available in $_FILES[$fieldName]['error']. Possible error code values are: UPLOAD_ERR_OK (0) - There is no error,... 2016-10-14, ∼2043🔥, 0💬

Retrieving Values out of an Array in PHP
How To Retrieve Values out of an Array in PHP? You can retrieve values out of arrays using the array element expression $array[$key]. Here is a PHP example script: &lt;?php $languages = array(); $languages["Zero"] = "PHP"; $languages["One"] = "Perl"; $languages["Two"] = "Java"; print("Array with... 2016-10-15, ∼2034🔥, 0💬

INPUT Tag for File Uploading in PHP
Which HTML Tag Allows Users to Specify a File for Uploading in PHP? To present an input field on your Web page to allow users to specify a local file to upload, you need to use the &lt;INPUT TYPE="FILE" ...&gt; tag inside a &lt;FORM ...&gt; tag. The &lt;INPUT TYPE="FILE" ...&... 2016-10-17, ∼2030🔥, 0💬

Getting Uploaded File Information in PHP
How To Get the Uploaded File Information in the Receiving Script in PHP? Once the Web server received the uploaded file, it will call the PHP script specified in the form action attribute to process them. This receiving PHP script can get the uploaded file information through the predefined array ca... 2016-10-17, ∼2019🔥, 0💬

Performing Key Word Search in PHP
How To Perform Key Word Search in Tables in PHP? The simplest way to perform key word search is to use the SELECT statement with a LIKE operator in the WHERE clause. The LIKE operator allows you to match a text field with a keyword pattern specified as '%keyword%', where (%) represents any number of... 2016-10-17, ∼2001🔥, 0💬

Listing All Values of Submitted Fields in PHP
How To List All Values of Submitted Fields in PHP? If you want list all values of submitted fields, you can write a simple loop to retrieve all entries in the $_REQUEST array. Below is an improved version of processing_forms.php to list all submitted input values: &lt;?php print("&lt;html&am... 2016-11-15, ∼1984🔥, 0💬

Security of Storing Session ID as a Cookie in PHP
Is It More Secure to Use Cookies to Transfer Session IDs in PHP? Is it more secure to use cookies to transfer session IDs? The answer is yes, because attacking your Web site using URL parameters is much easier than using cookies. So if you are the system administrator of your Web server, you should ... 2016-10-25, ∼1973🔥, 0💬

Quoting Text Values in PHP
How To Quote Text Values in SQL Statements in PHP? Text values in SQL statements should be quoted with single quotes ('). If the text value contains a single quote ('), it should be protected by replacing it with two single quotes (''). In SQL language syntax, two single quotes represents one single... 2016-10-19, ∼1972🔥, 0💬

Retrieving the Last Auto Increment ID in PHP
How To Get the Last ID Assigned by MySQL in PHP? If you use an ID column with AUTO_INCREMENT attribute, you can use the mysql_insert_id() function to get the last ID value assigned by the MySQL server, as shown in the sample script below: &lt;?php include "mysql_connection.php"; $sql = "INSERT I... 2016-10-17, ∼1960🔥, 0💬

Deleting Existing Rows in PHP
How To Delete Existing Rows in a Table in PHP? If you want to remove a row from a table, you can use the DELETE statement with a WHERE clause to identify the row. The following sample script deletes one row: &lt;?php include "mysql_connection.php"; $sql = "DELETE FROM fyi_links WHERE id = 1102";... 2016-10-19, ∼1959🔥, 0💬

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Blockchain Container EPUB General HTML JSON Microsoft Node.js PHP Python RSS Tools Visual Studio Web