Some functions that are often used in PHP development

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Class useful{
/*
* Common function class
* Author: More than a rookie
* Contact Email: KINGERQ at MSN DOT com
* Date Created: 2005-07-18
* Source: Http://blog.csdn.net/kingerq
*/

/*
* Function: Format numbers, output in standard money format
*/

function FormatNumber ($num) {
Return Number_format ($num, 2, ".", ",");
}

/*
* Function: Format text, turn \ n into <br>
* Parameters: $string Source string
* Return: Processed string
*/
function formatstring ($string = "") {
$string = preg_replace (Array ("//", "///"), Array ("", ""), $string);
Return nl2br ($string);
}

/*
* Function: Format Text output
* parameter $text for text content that needs to be formatted
*/
function FormatContent ($text) {
$trans = get_html_translation_table (html_specialchars);
$trans = Array_flip ($trans);
$text = Strtr ($text, $trans);
$text = Str_replace ("\ n", "<br>", $text);
$text = Str_replace ("", "", $text);
return $text;
}

/*
* Convert bytes to KB or MB
* parameter $num to byte size
*/
function Bitsize ($num) {
if (!preg_match ("/^[0-9]+$/", $num)) return 0;
return $num > 1024? ($num/1024 > 1024 round ($num/1024/1024, 2). " Mb ": Round ($num/1024, 2)." Kb "): $num." Byte ";
}

/*
* Anti-injection processing (add a slash to the variable) function
* Parameter $array is an array of anti-injection variables
*/
Function add_s (& $array) {
foreach ($array as $key => $value) {
if (!is_array ($value)) {
$array [$key]=addslashes ($value);
}else{
$this->add_s ($array [$key]);
}
}
}

/*
* Convert HTML special characters (use when form is submitted, prevent malicious JS code)
* Parameter $array is a string or array to convert
*/
Function specialhtml (& $array) {
if (Is_array ($array)) {//array processing
foreach ($array as $key => $value) {
if (!is_array ($value)) {
$array [$key]=htmlspecialchars ($value);
}else{
$this->specialhtml ($array [$key]);
}
}
}else{
$array = Htmlspecialchars ($array);
}
}

/*
* Can avoid garbled interception of Chinese characters
* Parameter $str is a string, $start is a start character, $len end character
* Returns the intercepted character
*/
function Msubstr ($str, $start, $len) {
$tmpstr = "";
$strlen = $start + $len;
for ($i = 0; $i < $strlen; $i + +) {
if (Ord (substr ($str, $i, 1)) > 0xa0) {
$tmpstr. = substr ($str, $i, 2);
$i + +;
} else
$tmpstr. = substr ($str, $i, 1);
}
return $tmpstr;
}

/*
* Function: Comprehensive hint JS code output
* Parameter $msg to hint information
* $direct for prompt type 0 for prompt (default) 1 for prompt refresh return 2 for prompt return
* Output prompt code and end program
*/
function alert_msg ($msg, $direct = "0") {
Switch ($direct) {
Case ' 0 '://Prompt
$script = "";
Case ' 1 '://Prompt Refresh return
$script = "Location.href=\" "$_server[" Http_referer "]." \";";
Break
Case ' 2 '://Prompt return
$script = "History.back ();";
Break
default://tip to the specified page
$script = "Location.href=\" ". $direct." \";";
}
echo "<script language= ' JavaScript ' >window.alert ('. $msg. ');". $script. " </script> ";
Exit
}

/*
* Function: Get start date and end date of week with given date
* Parameters: $gdate date, default for the same day, format: YYYY-MM-DD
* $first Week in Monday or Sunday, 0 for Sunday, 1 for Monday
* Return: Array ("Start date", "End Date");
*/
function Aweek ($gdate = "", $first = 0) {
if (! $gdate) $gdate = Date ("y-m-d");
$w = Date ("W", Strtotime ($gdate));//Get the first day of the week, Sunday start 0-6
$dn = $w? $w-$first: 6;//number of days to subtract
$st = Date ("y-m-d", Strtotime ("$gdate-". $dn. "Days"));
$en = Date ("y-m-d", Strtotime ("$st +6 Days"));
Return Array ($st, $en);/back to start and end dates
}

/*
* Function: Check whether the page is legally connected.
* If it's illegal, turn to the landing window
*/
function Checkurl () {
If you connect to the page directly from the browser, connect to the login window
echo "Referer:". $_server[' Http_referer '];
if (!isset ($_server[' http_referer ')) {
Header ("location:index.php");
Exit
}
$urlar = Parse_url ($_server[' http_referer '));
If the domain name of the page is not a server domain, connect to the login window
if ($_server["Http_host"]!= $urlar ["HOST"]) {
Header ("location:index.php");
Exit
}
}

/*
* Read the contents of the file
* parameter $file as filename and full path
* Return the contents of the file
*/
function Readfiles ($file) {
$tdata = "";
$fp = fopen ($file, "R");

if (FileSize ($file) <= 0) return;

while ($data = Fread ($fp, FileSize ($file))) {
$tdata. = $data;
}
Fclose ($FP);
return $tdata;
}
}
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