Problem
Want to display PHP code with syntax highlighting (colors). This helps with debugging, etc.
Solution
Within PHP you can nicely display colorful text, which can be very useful for debugging or just to showcase your code.We simply use the highlight_file function within PHP, like this below.
Example
<?php highlight_file("transform.php"); ?>For a real-life demo, take a look here:see demo […]
Problem
You want to display a counter on your web page, but you do not want to use a db.
Solution
All you need to make this work is echo “1″ into a file called counter and ensure the web user has write access. For example: $ echo 1 > counter; chmod 777 counter;
Example
<?php$fh=fopen(“/tmp/counter.txt”, “r”);$cnt=fread($fh,filesize(“/tmp/counter.txt”));fclose($fh);$fh=fopen(“/tmp/counter.txt”, “w+”);if(fputs($fh,($cnt+1))) { […]
Problem
You want to open save the contents of a file, into a variable in PHP.
Solution
Simple demo on opening and reading contents of files in PHP.Script under example tab takes filename as a parameter, then opens it read-only and reads contents in data variable.Then it echoes a header and footer line, with the data in the […]
Problem
You want to intersperse HTML with PHP code.
Solution
Just getting back to basics, this is a very simple demoof how to implement PHP code along with HTML.
Example
<html><head>….<body><h1>Hello World</h1><?php if($_GET[runit]) { ?> <b>This will get displayed if ?runit=yes isappended to the web users request</b><?php } else { ?>nothing to see here … […]
Problem
You want to create an array, then traverse it.
Solution
Following up from part one - working with arrays.To spin through all elements in our names array, here is the code below.
Example
<?php$count=count($names);for ($i=0;$i<$count;$i++) { print($names[$i]."\n"); }?>Then for our string index array (hash):<?phpwhile(list($k,$v)=each($addresses)) { echo "$k lives at $v\n";}?>
Reference
Technorati Tags: PHP Arrays, […]
Problem
You want to work with string index arrays. Sometimes called Hashes.
Solution
PHP can handle number or string indexed arrays.Arrays can be initialized in a number of ways. For example:Basic array assignment and initialization, without specify numbers or strings:<?php$names[]=”joe”;$names[]=”john”;$names[]=”jim”;?>
Example
Specifically assigning values to numbered elements in the names array:<?php$names[0]="joe";$names[1]="john";$names[2]="jim";?>Quicker way to assign values to names array: […]
Problem
You want to perform regular expression with PHP.
Solution
Again PHP implementation of regular expression is very similar to Perl.In the simpliest form, pattern matching:$ php -q<<EOT<?php$str=”hello world”;if(ereg(”world”,”$str”)) { echo(”got a match”);}?>EOTgot a match
Example
Similarly eregi operates the same, just it is case insensitive.$ php -q<<EOT<?php$str="hello world";if(eregi("WORLD","$str")) { […]
Problem
You want to perform string manipulation with PHP.
Solution
Following on from the intro post, see the example tab for some more demos on PHP string manipulation.
Example
Counting the number of characters in a string:strlen$ php -q<<EOT<?phpecho(strlen("Hello World")."n");?>EOT11Converts an ASCII code to a character:chr$ php -q<<EOT<?phpecho(chr(65)."n");?>EOTA
Reference
Technorati Tags: PHP strlen, PHP chr, PHP Coding SchoolPHP Docs strlen […]
Problem
Substituting and trimming string variables in PHP.
Solution
Similar to Perl, PHP has an extensive library of functions.See the example tab for a few simple examples, showing the basic syntax.
Example
substr$ php -q<<EOT<?phpecho(substr("Hello World",0,4)."\n");?>EOTHelltrim$ php -q<<EOT<?phpecho(trim(” Hello World “).”\n”);?>EOTHello World
Reference
Technorati Tags: PHP substr, PHP trim, PHP Coding SchoolPHP Docs substr […]