PHP中日期时间函数date()用法总结

<?php
echo date("Y/m/d");
echo "<br />";
echo date("Y.m.d");
echo "<br />";
echo date("Y-m-d");
?>

echo date('Y-m-j');
2007-02-6

echo date('y-n-j');
07-2-6

echo date('Y-M-j');
2007-Feb-6

echo date('Y-m-d');
2007-02-06

echo date('Y-M-j');
2007-Feb-6

echo date('Y-F-jS');
2007-February-6th

echo date('g:i:s a');
5:56:57 am

echo date('h:i:s A');
05:56:57 AM

echo date('G:i:s');
14:02:26

<?php
$tomorrow = mktime(0,0,0,date("m"),date("d")+1,date("Y"));
echo "明天是 ".date("Y/m/d", $tomorrow);
?>

checkdate($month,$date,$year)

<?php
// returns false
echo checkdate(2,30,2005) ? "valid" : "invalid";
// returns true
echo checkdate(4,6,2010) ? "valid" : "invalid";
?>

getdate($ts)

<?php
// get date as associative array
$arr = getdate();
echo "Date is " . $arr['mday'] . " " . $arr['weekday'] . " " . $arr['year'];
echo "Time is " . $arr['hours'] . ":" . $arr['minutes'];
?>

 mktime($hour, $minute, $second, $month, $day, $year)

<?php
// returns timestamp for 13:15:23 7-Jun-2006
echo mktime(13,15,23,6,7,2006);
?>

 date($format, $ts)

<?php
// format current date
// returns "13-Sep-2005 01:16 PM"
echo date("d-M-Y h:i A", mktime());
?>

 strtotime($str)

<?php
// returns 13-Sep-05
echo date("d-M-y", strtotime("today"));
// returns 14-Sep-05
echo date("d-M-y", strtotime("tomorrow"));
// returns 16-Sep-05
echo date("d-M-y", strtotime("today +3 days"));
?>

 strftime($format,$ts)

<?php
// set locale to France (on Windows)
setlocale(LC_TIME, "fra_fra");

// format month/day names
// as per locale setting
// returns "septembre" and "mardi"

echo strftime("Month: %B ");
echo strftime("Day: %A ");
?>

<?php
// get starting value
$start = microtime();

// run some code
for ($x=0; $x<1000; $x++) {
$null = $x * $x;
}

// get ending value
$end = microtime();

// calculate time taken for code execution
echo "Elapsed time: " . ($end - $start) ." sec";
?>

<?php
// returns timestamp for 12:25:23 9-Jul-2006
echo gmmktime(12,25,23,7,9,2006);
?>

<?php
// format current date into GMT
// returns "13-Sep-2005 08:32 AM"
echo gmdate("d-M-Y h:i A", mktime());
?>

<?php
// set timezone to UTC
date_default_timezone_set('UTC');
?>

function array_to_json($array) {
 if (! is_array ( $array )) {
  return false;
 }
 
 $associative = count ( array_diff ( array_keys ( $array ), array_keys ( array_keys ( $array ) ) ) );
 if ($associative) {
 
  $construct = array ();
  foreach ( $array as $key => $value ) {
  
   // We first copy each key/value pair into a staging array,
   // formatting each key and value properly as we go.
  

   // Format the key:
   if (is_numeric ( $key )) {
    $key = "key_$key";
   }
   $key = """ . addslashes ( $key ) . """;
  
   // Format the value:
   if (is_array ( $value )) {
    $value = array_to_json ( $value );
   } else if (! is_numeric ( $value ) || is_string ( $value )) {
    $value = """ . addslashes ( $value ) . """;
   }
  
   // Add to staging array:
   $construct [] = "$key: $value";
  }
 
  // Then we collapse the staging array into the JSON form:
  $result = "{" . implode ( ",", $construct ) . "}";
 
 } else { // If the array is a vector (not associative):
 

  $construct = array ();
  foreach ( $array as $value ) {
  
   // Format the value:
   if (is_array ( $value )) {
    $value = array_to_json ( $value );
   } else if (! is_numeric ( $value ) || is_string ( $value )) {
    $value = """ . addslashes ( $value ) . """;
   }
  
   // Add to staging array:
   $construct [] = $value;
  }
 
  // Then we collapse the staging array into the JSON form:
  $result = "[" . implode ( ", ", $construct ) . "]";
 }
 
 return $result;
}

<?php
if($_GET['enews']=='ok'){
    echo json_encode(array('a'=>'王进'));exit;
}
?>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(function(){
    $.get("?enews=ok", function(result){
    alert(result);
 });
});
</script>

<?php
function send_mail($from, $to, $subject, $message)
{
    if ($from == "")
    {
        $from = '回忆未来 <webmaster@s135.com>';//发件人地址
    }
    $headers = 'MIME-Version: 1.0' . "rn";
    $headers .= 'Content-type: text/html; charset=gb2312' . "rn";
    $headers .= 'From: ' . $from . "rn";
    mail($to, $subject, $message, $headers);
}
?>

function str_replace_once($needle, $replace, $haystack) {

$pos = strpos($haystack, $needle);

if ($pos === false) {

return $haystack;

}

return substr_replace($haystack, $replace, $pos, strlen($needle));

}