Snippets Archives

Clear the browser cache of CSS or JavaScript Using PHP

Snippets

Other than caching every hour, or every week, you may cache according to file data.

1	<script src="js/my_script.js?v=<?=md5_file('js/my_script.js')?>"></script>

or use file modification time:

1	<script src="js/my_script.js?v=<?=filemtime('js/my_script.js')?>"></script>

or use file modification every hour:

1	<script type="text/javascript" src="js/myscript.js?v=<?php echo date('YmdHis'); ?>"></script>

or Using Javascript

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function reloadScripts(toRefreshList/* list of js to be refresh */, key /* change this key every time you want force a refresh */) {

var scripts = document.getElementsByTagName('script');

for(var i = 0; i < scripts.length; i++) {

var aScript = scripts[i];

for(var j = 0; j < toRefreshList.length; j++) {

var toRefresh = toRefreshList[j];

if(aScript.src && (aScript.src.indexOf(toRefresh) > -1)) {

new_src = aScript.src.replace(toRefresh, toRefresh + '?k=' + key);

// console.log('Force refresh on cached script files. From: ' + aScript.src + ' to ' + new_src)

aScript.src = new_src;

}

Current Site URL – Codeigniter

Snippets

To get host url of current server simply replace

application\config\config.php

1	$config['base_url'] = '';

with

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// Home URL

$sysurl = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == "on") ? "https" : "http");

$sysurl .= "://" . $_SERVER['HTTP_HOST'];

$sysurl .= str_replace(basename($_SERVER['SCRIPT_NAME']), "", $_SERVER['SCRIPT_NAME']);

$config['base_url'] = $sysurl;

PHP: fopen error handling

Snippets

You should first test the existence of a file by file_exists().

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try

{

$fileName = 'uploads/Team/img/'.$team_id.'.png';

if ( !file_exists($fileName) ) {

throw new Exception('File not found.');

}

$fp = fopen($fileName, "rb");

if ( !$fp ) {

throw new Exception('File open failed.');

}

$str = stream_get_contents($fp);

fclose($fp);

// send success JSON

} catch ( Exception $e ) {

// send error message if you can

}

or simple solution without exceptions:

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$fileName = 'uploads/Team/img/'.$team_id.'.png';

if ( file_exists($fileName) && ($fp = fopen($fileName, "rb"))!==false ) {

$str = stream_get_contents($fp);

fclose($fp);

// send success JSON

}

else

{

// send error message if you can

}

Random String PHP

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function generateRandomString($length = 10) {

$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

$charactersLength = strlen($characters);

$randomString = '';

for ($i = 0; $i < $length; $i++) {

$randomString .= $characters[rand(0, $charactersLength - 1)];

}

return $randomString;

}

Output the random string with the call below:

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// Echo the random string.

// Optionally, you can give it a desired string length.

echo generateRandomString();

PHP function to make slug (URL string)

Snippets

Note: from WordPress

Use it like this:

1	echo sanitize('testing this link');

Code:

//taken from wordpress
function utf8_uri_encode( $utf8_string, $length = 0 ) {
    $unicode = '';
    $values = array();
    $num_octets = 1;
    $unicode_length = 0;

$string_length = strlen( $utf8_string );
    for ($i = 0; $i < $string_length; $i++ ) {

$value = ord( $utf8_string[ $i ] );

if ( $value < 128 ) {
            if ( $length && ( $unicode_length >= $length ) )
                break;
            $unicode .= chr($value);
            $unicode_length++;
        } else {
            if ( count( $values ) == 0 ) $num_octets = ( $value < 224 ) ? 2 : 3;

$values[] = $value;

if ( $length && ( $unicode_length + ($num_octets * 3) ) > $length )
                break;
            if ( count( $values ) == $num_octets ) {
                if ($num_octets == 3) {
                    $unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]) . '%' . dechex($values[2]);
                    $unicode_length += 9;
                } else {
                    $unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]);
                    $unicode_length += 6;
                }

$values = array();
                $num_octets = 1;
            }
        }
    }

return $unicode;
}

//taken from wordpress
function seems_utf8($str) {
    $length = strlen($str);
    for ($i=0; $i < $length; $i++) {
        $c = ord($str[$i]);
        if ($c < 0x80) $n = 0; # 0bbbbbbb
        elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb
        elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb
        elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb
        elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb
        elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b
        else return false; # Does not match any model
        for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?
            if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))
                return false;
        }
    }
    return true;
}

//function sanitize_title_with_dashes taken from wordpress
function sanitize($title) {
    $title = strip_tags($title);
    // Preserve escaped octets.
    $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
    // Remove percent signs that are not part of an octet.
    $title = str_replace('%', '', $title);
    // Restore octets.
    $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);

if (seems_utf8($title)) {
        if (function_exists('mb_strtolower')) {
            $title = mb_strtolower($title, 'UTF-8');
        }
        $title = utf8_uri_encode($title, 200);
    }

$title = strtolower($title);
    $title = preg_replace('/&.+?;/', '', $title); // kill entities
    $title = str_replace('.', '-', $title);
    $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
    $title = preg_replace('/\s+/', '-', $title);
    $title = preg_replace('|-+|', '-', $title);
    $title = trim($title, '-');

return $title;
}

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//taken from wordpress

function utf8_uri_encode( $utf8_string, $length = 0 ) {

$unicode = '';

$values = array();

$num_octets = 1;

$unicode_length = 0;

$string_length = strlen( $utf8_string );

for ($i = 0; $i < $string_length; $i++ ) {

$value = ord( $utf8_string[ $i ] );

if ( $value < 128 ) {

if ( $length && ( $unicode_length >= $length ) )

break;

$unicode .= chr($value);

$unicode_length++;

} else {

if ( count( $values ) == 0 ) $num_octets = ( $value < 224 ) ? 2 : 3;

$values[] = $value;

if ( $length && ( $unicode_length + ($num_octets * 3) ) > $length )

break;

if ( count( $values ) == $num_octets ) {

if ($num_octets == 3) {

$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]) . '%' . dechex($values[2]);

$unicode_length += 9;

} else {

$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]);

$unicode_length += 6;

}

$values = array();

$num_octets = 1;

}

return $unicode;

}

//taken from wordpress

function seems_utf8($str) {

$length = strlen($str);

for ($i=0; $i < $length; $i++) {

$c = ord($str[$i]);

if ($c < 0x80) $n = 0; # 0bbbbbbb

elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb

elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb

elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb

elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb

elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b

else return false; # Does not match any model

for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?

if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))

return false;

}

return true;

}

//function sanitize_title_with_dashes taken from wordpress

function sanitize($title) {

$title = strip_tags($title);

// Preserve escaped octets.

$title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);

// Remove percent signs that are not part of an octet.

$title = str_replace('%', '', $title);

// Restore octets.

$title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);

if (seems_utf8($title)) {

if (function_exists('mb_strtolower')) {

$title = mb_strtolower($title, 'UTF-8');

}

$title = utf8_uri_encode($title, 200);

}

$title = strtolower($title);

$title = preg_replace('/&.+?;/', '', $title); // kill entities

$title = str_replace('.', '-', $title);

$title = preg_replace('/[^%a-z0-9 _-]/', '', $title);

$title = preg_replace('/\s+/', '-', $title);

$title = preg_replace('|-+|', '-', $title);

$title = trim($title, '-');

return $title;

}

Include all files with in the folder

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foreach (glob("assets/lib/*.php") as $filename) {

include $filename;

}

How can I remove 3 characters at the end of a string in php?

Snippets

1	echo substr("abcabcabc", 0, -3);

or

1	echo substr($string, 0, strlen($string) - 3);

Print all value of an array – Smarty

Snippets

1	{$foo\|@print_r}

Receive JSON POST with PHP

Snippets

1	$HTTP_RAW_POST_DATA

instead of

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$_POST

It will give you POST data as is. You will be able to decode it using

1	json_decode()

later

Adding divs to a foreach loop every 4 times

Snippets

The output look like:

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<div>

kicks brand

</div>

<div>

kicks brand

</div>

<div>

kicks brand

</div>

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$count = 1;

foreach( $array_var as $var )

{

if ($count%4 == 1)

{

echo "<div>";

}

// Code

if ($count%4 == 0)

{

echo "</div>";

}

$count++;

}

if ($count%4 != 1) echo "</div>"; //This is to ensure there is no open div if the number of elements in user_kicks is not a multiple of 4

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