PHP Tutorials Code Snippets and Php Tips » Basic PHP

PHP Tutorial : Write to a file with fwrite

admin — Thu, 11 Jun 2009 05:22:05 +0000

I showed you earlier in a older post how to open and read text contents from a file. Now it’s time to see how to write to a file using php function called fwrite().

<?php
$theFileToWriteTo = "textFile.txt";
$fileHandle = fopen($theFileToWriteTo, 'w') or die("cannot open the text file");
$textToWrite = "First text to write here\n";
fwrite($fileHandle, $textToWrite);
$textToWrite = "Second line to write here\n";
fwrite($fileHandle, $textToWrite);
fclose($fileHandle)
?>

Note that “\n” means new line!

PHP Tutorial : Multiple string replace with str_replace

admin — Thu, 11 Jun 2009 04:58:33 +0000

Well, I already writed about str_replace php function but this tip is very usefull. To recap, the function it’s used to replace a string by using three paramaters : $stringToSearch, $stringToReplace, $intoString. I showed you how to use it in single operations but we can use it for multiple replaces in one place, by using arrays :

<?php
$searchArray = array("word1", "sound2", "etc3");
$replaceArray = array("word one", "sound two", "etc three");
$intoString = "Here is word1, as well sound2 and etc3";
//now let's replace


print str_replace($searchArray, $replaceArray, $intoString);
//it should print "Here is word one, as well sound two and etc three"

?>

I have to say this multiple replace “trick” is a very nice one!

See ya soon!

PHP Tutorial : Strpos and Strrpos

admin — Tue, 09 Jun 2009 15:31:11 +0000

Basic thing, strpos and strrpos are two php functions which are used to find the position of first and/or last occurrence in a string – word (usefull for example when you want to build a function to get file extension). I hear you saying enough talking, let me see the available examples :

<?php
//get first occurrence

$string = "this string";
$find = "i";

print strpos($string,$find);//should print 2


print strrpos($string,$find); //should print 8

?>

PHP Tutorial : String lenght with strlen

admin — Tue, 26 May 2009 20:13:34 +0000

I’ll be directly on this short one. Shame on me that I didn’t writed about this untill now : there’s an interesting php function which you might need frequently called strlen() which translates into string lenght. I’m sure you met it already into previous tutorials on this php tutorials blog but I think I didn’t made a post separately for this only so :

<?php
$stringLenght = "Count this characters";

print strlen($stringLenght);
?>

PHP Tutorial : If condition in the short way (shorthand if)

admin — Thu, 21 May 2009 12:52:59 +0000

Do you know basical php if() condition right? But, my questions is : do you know the short way? If not, I will show you the diferrence,:

<?php
$a=1;
$b=3;
$c = $a+$b;
//THE SHORT WAY COMES
print $c == 3 ? "yes $c = 3" : "no $c != 3";
//THE "COMMON" WAY SAME THING


if($c ==3) {
print "yes $c = 3";
}else{
print "no $c != 3";
}
?>

PHP Tutorial : PHP $_POST array

admin — Sun, 12 Apr 2009 09:40:09 +0000

Hello folks,

BTW Happy Easter,my traffic this weekend decreased dramatically because of the hollidays, I hope you enjoy it.

I want to clarify something that I might missed to say about php $_POST : this $_POST is an php array, if you want to see yourself, make recursive print with print_r() function. For example if you have a form, you can get all values in one time with this php $_POST array by typing

<?php
print_r($_POST);
?>

PHP Tutorial : Substract part of string with substr

admin — Fri, 10 Apr 2009 07:16:26 +0000

Hello,

I didn’t posted for a long time because I am simply stucked into finding a subject. I made a search into my own blog and I saw that (miraculous btw) I didn’t writed yet about substr function which helps you to print only a part of a string – substract it!

<?php
$stringIs = "mystring";
$substract = substr($stringIs, 0, 3);
print $subtract; //this will print my

?>

First you declare the string you want substracted, then first number means from where to start and the last no. means where to finish.

Taddaaa!

PHP Tutorial : Forms processing with $_POST or $_GET

admin — Thu, 26 Mar 2009 08:11:43 +0000

Are you just curious to know the difference between $_GET and $_POST php server variables? Errrr, let me try and explain. I dont see many differences, or maybe I dont know/explain, but what I understand it is that $_POST it’s used in most of the cases because security, and $_GET will show your entered forms fields values into the url. For example :

"" method="POST">
Your field value here "text" name="fieldname">
"submit" name="sb" id="sb" value="Go">

<?php
//check if form was sent


if(isset($_POST['sb'])) {
print $_POST['fieldname'];
}
//this with post will not show values into url

?>
"" method="GET">
Your field value here "text" name="fieldname">
"submit" name="sb" id="sb" value="Go">

As for get, you will see after you submit your form that value entered will showup in url
<?php

if(isset($_GET['sb'])) {
print $_GET['fieldname'];
}
//and check your url, if you make a forms.php page, and hit submit you'll see //forms.php?fieldname=whatyouentered&amp;sb=Go

?>

PHP Tutorial : Clear white spaces

admin — Mon, 23 Mar 2009 15:23:50 +0000

Ever got extra white spaces and dont wanna clear them manually or just cannot? In PHP, we have a great function called trim(), which will do your job. If you made a .htaccess rewrite (most of the cases), or just a form input to validate and clear its extra white spaces just do a trim().

<?php
$extraWhiteSpace = " bla bllla  b   l      a";
$extraWhiteSpace = trim($extraWhiteSpace);
?>

PHP Tutorial : Lowercase characters

admin — Thu, 19 Mar 2009 07:28:59 +0000

In a recent post I’ve been writed about converting string to uppercase, now we need to know how to convert characters into lowercase. That will need strtolower() function which means string to lower.

<?php
$bigger = "This Is Big";
$lower = strtolower($bigger);
//will print this is big

?>