Nifty Looping
This looping can allow you to loop by even numbers, by 2's, 3's, odd numbers, ... etc. Up until I found this nifty looping trick, I used to use modulus' to achieve, say even numbers -- not to mention having to next some if's.
To understand this, notice in the for loop that there is a comma instead of a semicolon.
for ( $i = 0; $i++, $i < 10; $i++ )
echo $i . '<br/>';
?>
will result in the following:
3
5
7
9
In addition to this, you can also loop through 2 or more variables at the same time with one for loop, as in the example below.
Read files and directories
Read directory in reverse order
$Results = glob( 'blah.*' );
rsort( $Results );
foreach($Results as $line){
print($line);
}
?>
Read a directory
while($file = readdir($directory)){
print("$file <br />"); ### This also prints . and .. (You might filter out at least . )
}
Many times when you just read a directory, the items will not appear an any certain order. To order them alphabetically, try this,
while($files = readdir($directory)){
$myfile[] = $files;
}
sort($myfile);
foreach($myfile as $file){
print("$file <br />"); ### This also prints . and .. (You might filter out at least . )
}
Once the list of files are in the array, you can manipulate the array in many other ways. One useful way is,
then you can perform the foreach. To filter out '.' and '..' you can use an if statement before the print like if(!eregi("^.",$file)).
Read a file
while(!feof($fp)){
$line = fgets($fp);
$line = eregi_replace("n","",$line); ### This line is optional, but useful if you want to perform
### certain eregi_replace's, for example
### eregi_replace("some text$","new text",$line);
### In that case, if you don't get rid of the n's first
### you would have to do, eregi_replace("some textn$","newtext",$line);
### first. You can also use for html output
### eregi_replace("n","<br />n",$line); ... etc
print("$line");
}
Strings
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