Category Archives: PHP

Php tutorials

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Get http request headers in php

By Silver Moon | November 22, 2011

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When a browser makes a request to a php script, the browser sends some http headers which can look like this : Host: localhost Connection: keep-alive User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Accept-Charset: UTF-8,*;q=0.5 Cookie: username=admin; password=21232ffc3; PHPSESSID=o5m4e2td1m66c4pkjdag9vs0u2 The php script under request ,… Read More »

PHP get DNS Nameserver , Cname , MX , A records of a domain

By Silver Moon | March 2, 2021

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PHP has a useful function called dns_get_record that can be used to get different types of records for a give domain , very easily. These include the nameserver records, A records, CNAME records, MX records, SOA records etc. The following examples are using the interactive shell, but you would use the function the same way… Read More »

Parse MVC style urls in PHP

By Silver Moon | November 9, 2011

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If you have used codeigniter or some mvc php framework then you might be aware of urls like www.yoursite.com/index.php/class/method/param1/param2?a=b&c=d or www.yoursite.com/class/method/param1/param2?a=b&c=d if you use mod rewrite to add the index.php The htaccess code could be like this : <IfModule mod_rewrite.c> #Start the rewrite engine RewriteEngine on #If requested thing is not a file or directory… Read More »

Write a simple PHP Hit Counter Script

By Silver Moon | October 29, 2011

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In this tutorial, I am going to show you a simple way to write a Hit Counter script in PHP to save and display the number of visits to your website. We will basically store and increment the hits in a file, that can be used to display the total hit count as well. The… Read More »

PHP best way to check if file is an image

By Silver Moon | October 23, 2011

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The getimagesize function of php provides lot of information about an image file , including its type. The type can be used to check if the file is a valid image file or not. To check if a file is an image or not, use the function function is_image($path) { $a = getimagesize($path); $image_type =… Read More »

PHP manage multiple cronjobs with a single crontab entry

By Silver Moon | October 23, 2011

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In many php applications there are multiple tasks that need to be run via cron at different times. In a typical application you may be doing the following tasks via cronjobs : 1. Backup database. 2. Send out email to subscribers. 3. Clear temporary files. 4. Fetch xml feeds from some source and store them… Read More »

PHP check if a timestamp matches a given cron schedule

By Silver Moon | October 23, 2011

2 Comments

desktop:~$ php -a Interactive shell php > echo time(); 1319362432 php > Above is an example of a given timestamp. And a cron schedule can look like this 0 5 * * * – which means run everyday at 5 hours and 0 minutes. Now in a php application you may need to test if… Read More »

PHP strtotime in 64 bit environment

By Silver Moon | October 23, 2011

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The strtotime function is used to convert a date in various formats to a timestamp. However its behaviour is different based on architecture it is running on, whether 32bit or 64bit. Lets take a few examples : In 64 bit environment desktop:~$ php -a Interactive shell php > echo strtotime("0000-00-00 00:00:00"); -62170005200 php > echo… Read More »

PHP create nested directories for a given path

By Silver Moon | October 22, 2011

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If a file is to be saved in at path /var/www/a/b/c/d/abc.zip where the directory c and d dont exist then the directories have to created. Here is a function that uses recursion to check for directories in a path and create them if they do not exist : /** Make a nested path , creating… Read More »

Category Archives: PHP

Get http request headers in php

PHP get DNS Nameserver , Cname , MX , A records of a domain

Parse MVC style urls in PHP

Write a simple PHP Hit Counter Script

PHP best way to check if file is an image

PHP manage multiple cronjobs with a single crontab entry

PHP check if a timestamp matches a given cron schedule

PHP strtotime in 64 bit environment

PHP create nested directories for a given path

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