87 lines
2.3 KiB
PHP
87 lines
2.3 KiB
PHP
<?php
|
|
/**
|
|
* Shaarli utilities
|
|
*/
|
|
|
|
/**
|
|
* Returns the small hash of a string, using RFC 4648 base64url format
|
|
*
|
|
* Small hashes:
|
|
* - are unique (well, as unique as crc32, at last)
|
|
* - are always 6 characters long.
|
|
* - only use the following characters: a-z A-Z 0-9 - _ @
|
|
* - are NOT cryptographically secure (they CAN be forged)
|
|
*
|
|
* In Shaarli, they are used as a tinyurl-like link to individual entries,
|
|
* e.g. smallHash('20111006_131924') --> yZH23w
|
|
*/
|
|
function smallHash($text)
|
|
{
|
|
$t = rtrim(base64_encode(hash('crc32', $text, true)), '=');
|
|
return strtr($t, '+/', '-_');
|
|
}
|
|
|
|
/**
|
|
* Tells if a string start with a substring
|
|
*/
|
|
function startsWith($haystack, $needle, $case=true)
|
|
{
|
|
if ($case) {
|
|
return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
|
|
}
|
|
return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
|
|
}
|
|
|
|
/**
|
|
* Tells if a string ends with a substring
|
|
*/
|
|
function endsWith($haystack, $needle, $case=true)
|
|
{
|
|
if ($case) {
|
|
return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
|
|
}
|
|
return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
|
|
}
|
|
|
|
/**
|
|
* Same as nl2br(), but escapes < and >
|
|
*/
|
|
function nl2br_escaped($html)
|
|
{
|
|
return str_replace('>','>',str_replace('<','<',nl2br($html)));
|
|
}
|
|
|
|
/**
|
|
* htmlspecialchars wrapper
|
|
*/
|
|
function escape($str)
|
|
{
|
|
return htmlspecialchars($str, ENT_COMPAT, 'UTF-8', false);
|
|
}
|
|
|
|
/**
|
|
* Link sanitization before templating
|
|
*/
|
|
function sanitizeLink(&$link)
|
|
{
|
|
$link['url'] = escape($link['url']); // useful?
|
|
$link['title'] = escape($link['title']);
|
|
$link['description'] = escape($link['description']);
|
|
$link['tags'] = escape($link['tags']);
|
|
}
|
|
|
|
/**
|
|
* Checks if a string represents a valid date
|
|
*
|
|
* @param string a string-formatted date
|
|
* @param format the expected DateTime format of the string
|
|
* @return whether the string is a valid date
|
|
* @see http://php.net/manual/en/class.datetime.php
|
|
* @see http://php.net/manual/en/datetime.createfromformat.php
|
|
*/
|
|
function checkDateFormat($format, $string)
|
|
{
|
|
$date = DateTime::createFromFormat($format, $string);
|
|
return $date && $date->format($string) == $string;
|
|
}
|
|
?>
|