simple-oai-pmh/oaidp-util.php

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<?php
/**
* \file
* \brief Utilities for the OAI Data Provider
*
* A collection of functions used.
*/
/** Validates an identifier. The pattern is: '/^[-a-z\.0-9]+$/i' which means
* it accepts -, letters and numbers.
* Used only by function <B>oai_error</B> code idDoesNotExist.
* \param $url Type: string
*/
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function is_valid_uri($url) {
return((bool)preg_match('/^[-a-z\.0-9]+$/i', $url));
}
/** Validates attributes come with the query.
* It accepts letters, numbers, ':', '_', '.' and -.
* Here there are few more match patterns than is_valid_uri(): ':_'.
* \param $attrb Type: string
*/
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function is_valid_attrb($attrb) {
return preg_match("/^[_a-zA-Z0-9\-\:\.]+$/",$attrb);
}
/** All datestamps used in this system are GMT even
* return value from database has no TZ information
*/
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function formatDatestamp($datestamp) {
return date("Y-m-d\TH:i:s\Z",strtotime($datestamp));
}
/** The database uses datastamp without time-zone information.
* It needs to clean all time-zone informaion from time string and reformat it
*/
function checkDateFormat($date) {
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$date = str_replace(array("T","Z")," ",$date);
$time_val = strtotime($date);
if(!$time_val) return false;
if(strstr($date,":")) {
return date("Y-m-d H:i:s",$time_val);
} else {
return date("Y-m-d",$time_val);
}
}