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PHP: Misc
PHP Misc
================================================================================================
Difference between two dates
$date1 = new DateTime('2007-03-24');
$date2 = new DateTime('2009-06-26');
$interval = $date1->diff($date2);
echo 'difference: ' . $interval->y . ' years, ' . $interval->m.' months, '.$interval->d.' days ';
---
Trim ending slashes
$string = 'http://google.com/';
if(substr($string, -1) == '/') {
$string = substr($string, 0, -1);
}
//
$string = rtrim($string, '/');
echo $string;
---
Check if string contains substring
if( strpos( $string, $substring ) === false ) { // substring not found in string
// code
} else { // substring found in string
// code
}
---
Create zip file
/* creates a compressed zip file */
function create_zip($files = array(),$destination = '',$overwrite = false) {
//if the zip file already exists and overwrite is false, return false
if(file_exists($destination) && !$overwrite) { return false; }
//vars
$valid_files = array();
//if files were passed in...
if(is_array($files)) {
//cycle through each file
foreach($files as $file) {
//make sure the file exists
if(file_exists($file)) {
$valid_files[] = $file;
}
}
}
//if we have good files...
if(count($valid_files)) {
//create the archive
$zip = new ZipArchive();
if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
return false;
}
//add the files
foreach($valid_files as $file) {
$zip->addFile($file,$file);
}
//debug
//echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;
//close the zip -- done!
$zip->close();
//check to make sure the file exists
return file_exists($destination);
}
else
{
return false;
}
}
// Usage
$files_to_zip = array(
'preload-images/1.jpg',
'preload-images/2.jpg',
'preload-images/5.jpg',
'kwicks/ringo.gif',
'rod.jpg',
'reddit.gif'
);
//if true, good; if false, zip creation failed
$result = create_zip($files_to_zip,'my-archive.zip');
---
Even or Odd
if ($i % 2) {
echo "$i is odd";
} else {
echo "$i is even";
}
---
Remove trailing zeros of a decimal number
function clean_num( $num ){
$pos = strpos($num, '.');
if($pos === false) { // it is integer number
return $num;
}else{ // it is decimal number
return rtrim(rtrim($num, '0'), '.');
}
}
echo clean_num(100.02);
---
array_map, array_walk and array_filter
$origarray1 = array(2.4, 2.6, 3.5);
$origarray2 = array(2.4, 2.6, 3.5);
print_r(array_map('floor', $origarray1)); // $origarray1 stays the same
// changes $origarray2
array_walk($origarray2, function (&$v, $k) { $v = floor($v); });
print_r($origarray2);
// this is a more proper use of array_walk
array_walk($origarray1, function ($v, $k) { echo "$k => $v", "\n"; });
// array_map accepts several arrays
print_r(
array_map(function ($a, $b) { return $a * $b; }, $origarray1, $origarray2)
);
// select only elements that are > 2.5
print_r(
array_filter($origarray1, function ($a) { return $a > 2.5; })
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