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<div class="post-523 post type-post hentry category-programming-php category-php" id="post-523">
<h2><a href="/" rel="bookmark" title="Permanent Link to Difference between is_file() and file_exists()">Difference between is_file() and file_exists()</a></h2>
<hr/>
<p><small>February 2nd, 2011 <!-- by admin --></small></p>
<div class="entry">
<div class="tweetmeme_button" style="float: right; margin-left: 10px;"><iframe src="https://api.tweetmeme.com/button.js?url=http%3A%2F%2Ftutorials.seopositiveltd.co.uk%2Fdifference-between-is_file-and-file_exists.php&style=normal" height="61" width="50" frameborder="0" scrolling="no"></iframe></div>
<p>One bug I fixed this week was down to one of the features of file_exists() function. File_exists(string $filename ) will return true if the filename points to a file <em>or directory</em>. Is_file( string $filename ) will return false if the given path is a directory. To check whether filename is actually a file, use is_file().</p>
<p>For both, $filename cannot be a relative path, so I always use document root to ensure an absolute path.</p>
<p><code><br/>
<?php<br />
if( file_exists( $_SERVER{'DOCUMENT_ROOT'} . "/images/picture.jpg")) {<br/>
...<br/>
}<br/>
?><br/>
</code></p>
</div>
<p class="postmetadata"> Posted in <a href="../../../tutorials-sub/category/php/programming-php" title="View all posts in Programming PHP" rel="category tag">Programming PHP</a>, <a href="../../../tutorials-sub/category/php" title="View all posts in php" rel="category tag">php</a></p>
</div>
<div class="post-333 post type-post hentry category-programming-php category-apache category-css category-htmlxhtml category-javascript category-mysql category-php category-website-design tag-mysql tag-php tag-site-transfer" id="post-333">
<h2><a href="/" rel="bookmark" title="Permanent Link to Transferring websites, no fail">Transferring websites, no fail</a></h2>
<hr/>
<p><small>November 29th, 2010 <!-- by admin --></small></p>
<div class="entry">
<div class="tweetmeme_button" style="float: right; margin-left: 10px;"><iframe src="https://api.tweetmeme.com/button.js?url=http%3A%2F%2Ftutorials.seopositiveltd.co.uk%2Ftransferring-websites-no-fail.php&style=normal" height="61" width="50" frameborder="0" scrolling="no"></iframe></div>
<p>All developers have to transfer sites at some point, if you don’t I envy you. It seems that site transfers always have teething issues with the difference in server builds, operating systems having different compilations of PHP and the rest.</p>
<p>And worst of all, different hosts limitations…</p>
<p>But to transfer a site you need to make a simple list of things that need to be done in order for it to work.</p>
<ul>
<li>Get all files, including hidden files (many a time I’ve been caught up on the .htaccess on a mac being hidden and a site riddled with 404 errors…)</li>
<li>Get all database details of the new server</li>
<li>Update all calls to databases</li>
<li>Use Dream Weaver (for the only things its any good for) to search and replace across the site for the old URL and change it to the new one, and the same with database details)</li>
<li>Make sure image, stylesheet, javascript and any other call is base root not an absolute URL (unless externally hosted)</li>
<li>Upload everything, including creating the new databases</li>
<li>Test everything, fix bugs and teething issues</li>
</ul>
<p>If you can do all of the above your site will transfer easy peasy.</p>
</div>
<p class="postmetadata">Tags: <a href="/" rel="tag">mysql</a>, <a href="https://www.seopositiveltd.com/blog/tag" rel="tag">php</a>, <a href="/" rel="tag">site transfer</a><br/> Posted in <a href="../../../tutorials-sub/category/php/programming-php" title="View all posts in Programming PHP" rel="category tag">Programming PHP</a>, <a href="../../../tutorials-sub/category/apache" title="View all posts in apache" rel="category tag">apache</a>, <a href="../../../tutorials-sub/category/css" title="View all posts in css" rel="category tag">css</a>, <a href="../../../tutorials-sub/category/htmlxhtml" title="View all posts in html/xhtml" rel="category tag">html/xhtml</a>, <a href="../../../tutorials-sub/category/javascript" title="View all posts in javascript" rel="category tag">javascript</a>, <a href="../../../tutorials-sub/category/mysql" title="View all posts in mysql" rel="category tag">mysql</a>, <a href="../../../tutorials-sub/category/php" title="View all posts in php" rel="category tag">php</a>, <a href="../../../tutorials-sub/category/website-design" title="View all posts in website design" rel="category tag">website design</a></p>
</div>
<div class="post-321 post type-post hentry category-programming-php category-php tag-learn-php tag-php tag-php-ternary-operator tag-php-tutorials" id="post-321">
<h2><a href="/" rel="bookmark" title="Permanent Link to The Ternary Operator, minimising if and else">The Ternary Operator, minimising if and else</a></h2>
<hr/>
<p><small>November 24th, 2010 <!-- by admin --></small></p>
<div class="entry">
<div class="tweetmeme_button" style="float: right; margin-left: 10px;"><iframe src="https://api.tweetmeme.com/button.js?url=http%3A%2F%2Ftutorials.seopositiveltd.co.uk%2Fthe-ternary-operator-minimising-if-and-else.php&style=normal" height="61" width="50" frameborder="0" scrolling="no"></iframe></div>
<p>Every developer knows just how many if and else statements are needed for validation, data checks, state checks, etc.</p>
<p>And they take up a lot of space and cause necessary amounts of code, this tutorial is about to teach you a way to make your if and else statements all on one single line.</p>
<h1>Ternary Operator</h1>
<p>The ternary operator is an if else statement compressed to one single line using the ? and : operands, see below for an example ternary operator</p>
<pre class="brush: php">$apples = ( $colour == 'green' ) ? 'Tasty green apples' : 'Nasty rotten apples' ;
</pre>
<p>The above is the exact equivalent to the below:</p>
<pre class="brush: php">if( $color == 'green' ) {
$apples = 'Tasty green apples';
}
else {
$apples = 'Nasty rotten apples';
}
</pre>
<p>Which we can all agree is far more troublesome and big, some people say that an if and else statement is easier to read than a ternary operator. It can be argued until man steps foot on Mars its a personal preference thing. Personally, I use the ternary operator wherever possible but sometimes its not possible. See below for an example that you couldn’t use a ternary operator for:</p>
<pre class="brush: php">
if ( $database->row_result == 'something' ) {
$database->row_result = substr ( $database->row_result, 0, 100 );
$this->some_cool_function( $database->row_result );
return validate_the_above ( );
}
else {
throw new RunTimeException ( 'the result was in a malformed state' );
exit;
}
</pre>
<p>The reason the above will not work in a ternary operator is the required state involves multiple lines of code in order to finish the operation (whatever yours is) and a ternary operator will only handle function calls, variable setting and validation.</p>
<p>In essence the ternary operator is a great getter and setter method (until PHP6 is released with C style getters and setters).</p>
<p>But what if you only wanted to validate something was there and use the else?</p>
<p>Since PHP 5.3 they have made this shortcut available see below for an example.</p>
<pre class="brush: php">
$apples = ( $colour == 'brown' ) ?: 'Nasty rotten apples';
</pre>
<p>Notice the above has no true statement and will only set in the event of a false validation.</p>
</div>
<p class="postmetadata">Tags: <a href="/" rel="tag">learn php</a>, <a href="https://www.seopositiveltd.com/blog/tag" rel="tag">php</a>, <a href="/" rel="tag">php ternary operator</a>, <a href="/" rel="tag">PHP Tutorials</a><br/> Posted in <a href="../../../tutorials-sub/category/php/programming-php" title="View all posts in Programming PHP" rel="category tag">Programming PHP</a>, <a href="../../../tutorials-sub/category/php" title="View all posts in php" rel="category tag">php</a></p>
</div>
<div class="post-271 post type-post hentry category-programming-php category-apache category-php tag-php tag-php-tutorial tag-php-tutorials" id="post-271">
<h2><a href="../../../tutorials-sub/php-file_get_contents-tutorials" rel="bookmark" title="Permanent Link to PHP file_get_contents tutorials">PHP file_get_contents tutorials</a></h2>
<hr/>
<p><small>November 22nd, 2010 <!-- by admin --></small></p>
<div class="entry">
<div class="tweetmeme_button" style="float: right; margin-left: 10px;"><iframe src="https://api.tweetmeme.com/button.js?url=http%3A%2F%2Ftutorials.seopositiveltd.co.uk%2Fphp-file_get_contents-tutorials.php&style=normal" height="61" width="50" frameborder="0" scrolling="no"></iframe></div>
<p>Anyone asking for the ability to pull data off another website or to globalise a collection of links or anything you want will come across the file_get_contents function. This function is very useful for data scraping or for generalising a collection of links or general content.</p>
<p>The function itself does nothing but puts the source of the web page you supply it into a string available for use throughout your script.</p>
<p>It does have sister functions such as file() which puts the source code into an indexed array (a new array element for every line of code) and CURL.</p>
<p>While there are a huge number of solutions to doing this, file_get_contents is for me the easiest as with regular expressions its unstoppable.</p>
<p>To use file_get_contents():</p>
<pre class="brush: php">$data = @file_get_contents( "https://www.bbc.co.uk/" );
if( $data ) echo htmlentities( $data );
</pre>
<p>The above will output the source code of the very latest BBC home page (with html entities so you get the source not just a reconstructed bbc home page)</p>
<p>Using regular expressions you can pull any piece of data throughout the source code.</p>
</div>
<p class="postmetadata">Tags: <a href="https://www.seopositiveltd.com/blog/tag" rel="tag">php</a>, <a href="/" rel="tag">php tutorial</a>, <a href="/" rel="tag">PHP Tutorials</a><br/> Posted in <a href="../../../tutorials-sub/category/php/programming-php" title="View all posts in Programming PHP" rel="category tag">Programming PHP</a>, <a href="../../../tutorials-sub/category/apache" title="View all posts in apache" rel="category tag">apache</a>, <a href="../../../tutorials-sub/category/php" title="View all posts in php" rel="category tag">php</a></p>
</div>
<div class="post-195 post type-post hentry category-programming-php category-apache category-php category-php-framework tag-frameworks tag-method-chaining tag-php tag-programming" id="post-195">
<h2><a href="/" rel="bookmark" title="Permanent Link to PHP Method Chaining">PHP Method Chaining</a></h2>
<hr/>
<p><small>November 3rd, 2010 <!-- by admin --></small></p>
<div class="entry">
<div class="tweetmeme_button" style="float: right; margin-left: 10px;"><iframe src="https://api.tweetmeme.com/button.js?url=http%3A%2F%2Ftutorials.seopositiveltd.co.uk%2Fphp-method-chaining.php&style=normal" height="61" width="50" frameborder="0" scrolling="no"></iframe></div>
<p>Method chaining is becoming an increasingly popular technique in the programmers world, but not a lot of people understand it.</p>
<p>This short tutorial will hopefully shed light on:</p>
<ol>
<li>what it is</li>
<li>what it does</li>
</ol>
<h3>So what is method chaining?</h3>
<p>To answer this question I have to show you some basic classes, see below for a standard class and method set.</p>
<pre class="brush: php">class random_functions{
function format($string, $f = 'uppercase'){
switch($f){
case 'uppercase':
$string = strtoupper($string);
break;
case 'lowercase':
$string = strtolower($string);
break;
}
return $string;
}
function strings($string, $filter = 'trim'){
switch($filter){
case 'trim':
$string = trim($string);
break;
case 'mres':
$string = mysql_real_escape_string($string);
break;
}
return $string;
}
}
</pre>
<p>To use the above class, instantiation is the usual</p>
<pre class="brush: php">$functions = new random_functions();
echo $functions->strings($functions->format($string, 'lowercase'), 'mres');
</pre>
<p>Which, to me at least, looks awful, its hard to read and just generally not very easy to work with.<br/>
What method chaining allows us to do is keep our functions separate and make our re-usable code a lot easier to read and understand as this requires a lot of logical thought in to how you want it to work and even makes planning easier due to having to put your functions in the correct order to achieve what you want.</p>
<p>See below for the same class that allows method chaining.</p>
<pre class="brush: php">class random_functions{
static $output = '';
function format($string, $f = 'uppercase'){
switch($f){
case 'uppercase':
self::$output = strtoupper($string);
break;
case 'lowercase':
self::$output = strtolower($string);
break;
}
return $this;
}
function strings($string = '', $filter = 'trim'){
switch($filter){
case 'trim':
self::$output = $string ? trim($string) : trim(self::$output);
break;
case 'mres':
self::$output = $string ? mysql_real_escape_string($string) : mysql_real_escape_string(self::$output);
break;
}
return $this;
}
function output($in = ''){
echo $in ? $in : self::$output;
return $this;
}
}
</pre>
<p>And the use of this is much clearer and much easier, see below for the use and an explanation of the code.</p>
<pre class="brush: php">$functions = new random_functions();
$functions->format('Foo Bar', 'lowercase')->strings()->output();
</pre>
<p>As you can see, there are arrows between each function call, this is called method chaining. This helps us keep our code clean, semantic and easy to read and understand.</p>
<p><strong>Lets analyze the code</strong></p>
<p>In order to make things easier I added a class variable to work from, this variable is available to every function within the class and I use it to validate input to functions and give us something to work from and around if needed. I also changed each <strong>return. </strong></p>
<p>Instead of returning our formatted string, I’ve changed each return to <strong>$this </strong>what $this means is “the current object” which in a class means the class object.</p>
<p><strong>The class object?</strong></p>
<p>Classes are objects, with children (the methods/functions within the class) and to make any function chainable within a class all you have to do is return an object. You cannot make static methods chainable i.e</p>
<pre class="brush: php">class random_functions{
static $output = '';
static function format($string, $f = 'uppercase'){
switch($f){
case 'uppercase':
self::$output = strtoupper($string);
break;
case 'lowercase':
self::$output = strtolower($string);
break;
}
return $this;
}
static function strings($string = '', $filter = 'trim'){
switch($filter){
case 'trim':
self::$output = $string ? trim($string) : trim(self::$output);
break;
case 'mres':
self::$output = $string ? mysql_real_escape_string($string) : mysql_real_escape_string(self::$output);
break;
}
return $this;
}
static function output($in = ''){
echo $in ? $in : self::$output;
return $this;
}
}
random_functions::format('Foo Bar', 'lowercase')::strings()::output();
</pre>
<p>Will not work, this will return a fatal error.</p>
<p>But to make a static method chainable you must return a new object as $this is undefined in a static method as the parent becomes <strong>self</strong></p>
<p>We hope that you enjoyed this tutorial and its helped you understand the ideology of method chaining and how it is useful.<strong><br/>
</strong></p>
</div>
<p class="postmetadata">Tags: <a href="/" rel="tag">frameworks</a>, <a href="/" rel="tag">method chaining</a>, <a href="https://www.seopositiveltd.com/blog/tag" rel="tag">php</a>, <a href="/" rel="tag">programming</a><br/> Posted in <a href="../../../tutorials-sub/category/php/programming-php" title="View all posts in Programming PHP" rel="category tag">Programming PHP</a>, <a href="../../../tutorials-sub/category/apache" title="View all posts in apache" rel="category tag">apache</a>, <a href="../../../tutorials-sub/category/php" title="View all posts in php" rel="category tag">php</a>, <a href="../../../tutorials-sub/category/php/php-framework" title="View all posts in php framework" rel="category tag">php framework</a></p>
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