本文介绍下，在php编程中，指定函数的默认值的方法，分享二个例子，供大家学习参考下
本节内容：
php函数指定默认值
在php编程中，为自定义函数设定默认值，当用户调用该函数时，如果不给参数指定值，参数会用默认值顶替。
例1，
代码如下:
php函数指定默认值-<br />
</head><br />
<body><br />
<?php<br />
function printMe($param = NULL)<br />
{<br />
print $param;<br />
}<br />
printMe("This is test");<br />
printMe();<br />
?><br />
<script type="text/javascript" src="/js/jquery.qqFace.js"></script>
</body><br />
</html><br />
<br />
输出结果：<br />
This is test<br />
例2，php函数参数默认值的使用范例，php函数参数中设置和使用默认值。<br />
代码：<br />
代码如下:<br />
<br />
<html><br />
<head><br />
<title>php函数参数默认值 - <br />
</head><br />
<body><br />
<?php<br />
function textonweb ($content, $fontsize=3){<br />
echo "<font SIZE=$fontsize>$content</font>";<br />
}<br />
textonweb ("A <br />", 7);<br />
textonweb ("AA.<br />");<br />
textonweb ("AAA. <br />");<br />
textonweb ("AAAA! <br />");<br />
?><br />
</body><br />
</html><br />
<br /> </div>
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</div>
</div>
</div>
</div>
<input type='hidden' id='report_url' value='/blog/ViewReport.html' />
<script type="text/javascript">
//测试字符串的长度 一个汉字算2个字节
function mb_strlen(str)
{
var len=str.length;
var totalCount=0;
for(var i=0;i<len;i++)
{
var c = str.charCodeAt(i);
if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {
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}else{
totalCount+=2;
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}
return totalCount;
}
/*
var Util = {};
Util.calWbText = function (text, max){
if(max === undefined)
max = 500;
var cLen=0;
var matcher = text.match(/[^\x00-\xff]/g),
wlen = (matcher && matcher.length) || 0;
//匹配url链接正则 http://***
var pattern = /http:\/\/([\w-]+\.)+[\w-]+(\/*[\w-\.\/\?%&=][^\s^\u4e00-\u9fa5]*)?/gi;
//匹配的数据存入数组
var arrPt = new Array();
var i = 0;
while((result = pattern.exec(text)) != null){
arrPt[i] = result[0];
i++;
}
//替换掉原文本中的链接
for(var j = 0;j<arrPt.length;j++){
text = text.replace(arrPt[j],"");
}
//减掉链接所占的长度
return Math.floor((max*2 - text.length - wlen)/2 - 12*i);
};
*/
var allowComment = '0';
//举报弹出层
function showJuBao(url, cid){
$.cover(false);
asyncbox.open({
id : 'report_thickbox',
url : url,
title : '举报违规',
width : 378,
height : 240,
scroll : 'no',
data : {
'cid' : cid,
'idtype' : 2 ,
'blogurl' : window.location.href
},
callback : function(action){
if(action == 'close'){
$.cover(false);
}
}
});
}
$(function(){
//创建管理员删除的弹出层
$('#admin_article_del').click(function(){
$.cover(false);
asyncbox.open({
id : 'class_thickbox',
html : '<div class="HT_layer3_1"><ul><li class="HT_li1">操作原因：<select class="HT_sel7" id="del_type" name="del_type"><option value="广告文章">广告文章</option><option value="违规内容">违规内容</option><option value="标题不明">标题不明</option><option value="文不对题">文不对题</option></select></li><li class="HT_li1" ><input class="HT_btn4" id="admin_delete" type="button" /></li></ul></div>',
title : '选择类型',
width : 300,
height : 150,
scroll : 'no',
callback : function(action){
if(action == 'close'){
$.cover(false);
}
}
});
});
$('#admin_delete').live('click' , function(){
///blog/logicdel/id/3480184/url/%252Fblog%252Findex.html.html
var type = $('#del_type').val();
var url = '/blog/logicdel/id/4024060/url/%252Fuid%252F29127426.html.html';
window.location.href= url + '?type=' + type;
});
//顶 js中暂未添加&过滤
$('#digg').live('click' , function(){
if(isOnLine == '' )
{
//showErrorMsg('登录之后才能进行此操作' , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
return false;
}
var bid = $('#digg').attr('bid');
var url = $('#digg').attr('url');
var digg_str = $.cookie('digg_id');
if(digg_str != null)
{
var arr= new Array(); //定义一数组
arr = digg_str.split(","); //字符分割
for( i=0 ; i < arr.length ; i++ )
{
if(bid == arr[i])
{
showErrorMsg('已经赞过该文章', '消息提示');
return false;
}
}
}
$.ajax({
type:"POST",
url:url,
data: {
'bid' : bid
},
dataType: 'json',
success:function(msg){
if(msg.error == 0)
{
var num = parseInt($('#digg_num').html(),10);
num += 1;
$('#digg_num').html(num);
$('#digg').die();
if(digg_str == null)
{
$.cookie('digg_id', bid, {expires: 30 , path: '/'});
}
else
{
$.cookie('digg_id', digg_str + ',' + bid, {expires: 30 , path: '/'});
}
showSucceedMsg('谢谢' , '消息提示');
}
else if(msg.error == 1)
{
//showErrorMsg(msg.error_content , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
}
else if(msg.error == 2)
{
showErrorMsg(msg.error_content , '消息提示');
}
}
});
});
//举报弹出层
/*$('.box_report').live('click' , function(){
if(isOnLine == '' )
{
//showErrorMsg('登录之后才能进行此操作' , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
return false;
}
var url = $('#report_url').val();
var cid = $(this).attr('cid');
$.cover(false);
asyncbox.open({
id : 'report_thickbox',
url : url,
title : '举报违规',
width : 378,
height : 240,
scroll : 'no',
data : {
'cid' : cid,
'idtype' : 2
},
callback : function(action){
if(action == 'close'){
$.cover(false);
}
}
});
});*/
//评论相关代码
//点击回复显示评论框
$('.Blog_a10').live('click' , function(){
if(isOnLine == '' )
{
//showErrorMsg('登录之后才能进行此操作' , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
return false;
}
if(allowComment == 1)
{
showErrorMsg('该博文不允许评论' , '消息提示');
return false;
}
var tid = $(this).attr('toid');//留言作者id
var bid = $(this).attr('bid');//blogid
var cid = $(this).attr('cid');//留言id
var tname = $(this).attr('tname');
var tpl = '<div class="Blog_right1_9">';
tpl += '<div class="div2">';
tpl += '<textarea name="" cols="" rows="" class="Blog_ar1_1" id="rmsg">文明上网，理性发言...</textarea>';
tpl += '</div>';
tpl += '<div class="div3">';
tpl += '<div class="div3_2"><a href="javascript:void(0);" class="Blog_a11" id="quota_sbumit" url="/Comment/PostComment.html" tid="'+tid+'" bid="'+bid+'" cid="'+cid+'" tname="'+tname+'" ></a><a href="javascript:void(0)" id="qx_comment" class="Blog_a12"></a></div>';
tpl += '<div class="div3_1"><a href="javascript:void(0);" id="mface"><span></span>表情</a></div>';
tpl += '<div class="clear"></div>';
tpl += '</div>';
tpl += '</div>';
$('.z_move_comment').html('');
$(this).parents('.Blog_right1_8').find('.z_move_comment').html(tpl).show();
});
//引用的评论提交
$('#quota_sbumit').live('click' , function(){
if(isOnLine == '' )
{
//showErrorMsg('登录之后才能进行此操作' , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
return false;
}
var bid = $(this).attr('bid');
var tid = $(this).attr('tid');//被引用人的id
var qid = $(this).attr('cid');//引用的id
var url = $(this).attr('url');
var text = $('#rmsg').val();
var tname = $(this).attr('tname');
if(text == '' || text=='文明上网，理性发言...')
{
showErrorMsg('评论内容不能为空！' , '消息提示');
return false;
}
else
{
if(mb_strlen(text) > 1000){
showErrorMsg('评论内容不能超过500个汉字' , '消息提示');
return false;
}
}
$.ajax({
type: "post",
url: url ,
data: {'bid': bid , 'to' : tid , 'qid' : qid , 'text': text , 'tname' : tname },
dataType: 'json',
success: function(data){
if(data.code == 1){
var tpl = '<div class="Blog_right1_8">';
tpl+= '<div class="Blog_right_img1"><a href="' +data.info.url+ '" >' + data.info.header + '</a></div>';
tpl+= '<div class="Blog_right_font1">';
tpl+= '<p class="Blog_p5"><span><a href="' +data.info.url+ '" >' + data.info.username + '</a></span>' + data.info.dateline + '</p>';
tpl+= '<p class="Blog_p7"><a href="' + data.info.quota.url + '">' + data.info.quota.username + '</a>：'+ data.info.quota.content + '</p>';
tpl+= '<p class="Blog_p8">' + data.info.content + '</p><span class="span_text1"><a href="javascript:void(0);" class="Blog_a10" toid=' + data.info.fuid + ' bid=' + data.info.bid + ' cid=' + data.info.cid + ' tname = ' + data.info.username + ' >回复</a> | <a class="comment_del_mark" style="cursor:pointer" url="' + data.info.delurl + '" >删除</a> | <a href="javascript:showJuBao(\'/blog/ViewReport.html\','+data.info.cid+')" class="box_report" cid="' + data.info.cid + '" >举报</a></span></div>';
tpl+= '<div class="z_move_comment" style="display:none"></div>';
tpl+= '<div class="Blog_line1"></div></div>';
$('#replyList .Blog_right1_8:first').before(tpl);
$('.z_move_comment').html('').hide();
}
else if(data.code == -1){
//showErrorMsg(data.info , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
}
},
error: function(){//请求出错处理
}
});
});
//底部发表评论
$('#submitmsg').click(function(){
if(allowComment == 1)
{
showErrorMsg('该博文不允许评论' , '消息提示');
return false;
}
var bid = $(this).attr('bid');
var toid = $(this).attr('toid');
var text = $('#reply').val();
var url = $(this).attr('url');
if(text == '' || text=='文明上网，理性发言...')
{
showErrorMsg('评论内容不能为空！' , '消息提示');
return false;
}
else
{
if(mb_strlen(text) > 1000){
showErrorMsg('评论内容不能超过500个汉字' , '消息提示');
return false;
}
}
$.ajax({
type: "post",
url: url ,
data: {'bid': bid , 'to' : toid ,'text': text},
dataType: 'json',
success: function(data){
if(data.code == 1)
{
var tpl = '<div class="Blog_right1_8">';
tpl += '<div class="Blog_right_img1"><a href="' +data.info.url+ '" >' + data.info.header + '</a></div>';
tpl += '<div class="Blog_right_font1">';
tpl += '<p class="Blog_p5"><span><a href="' +data.info.url+ '" >' + data.info.username + '</a></span>' + data.info.dateline + '</p>';
tpl += '<p class="Blog_p6">' + data.info.content + '</p>';
tpl += '<div class="div1"><a href="javascript:void(0);" class="Blog_a10" toid=' + data.info.fuid + ' bid=' + data.info.bid + ' cid=' + data.info.cid + '>回复</a> | <a class="comment_del_mark" style="cursor:pointer" url="' + data.info.delurl + '">删除</a> | <a href="javascript:showJuBao(\'/blog/ViewReport.html\','+data.info.cid+')" class="box_report" cid="' + data.info.cid + '">举报</a></div>';
tpl += '<div class="z_move_comment" style="display:none"></div>';
tpl += '</div><div class="Blog_line1"></div></div>';
$('.Blog_tit3:first').after(tpl);
$('#reply').val('文明上网，理性发言...');
}
else if(data.code == -1)
{
showErrorMsg(data.info , '消息提示');
}
},
error: function(){//请求出错处理
}
});
});
//底部评论重置
$('#reset_comment').click(function(){
$('#reply').val('文明上网，理性发言...');
});
//取消回复
$('#qx_comment').live('click' , function(){
$('.z_move_comment').html('').hide();
});
$('#rmsg, #reply').live({
focus:function(){
if($(this).val() == '文明上网，理性发言...'){
$(this).val('');
}
},
blur:function(){
if($(this).val() == ''){
$(this).val('文明上网，理性发言...');
}
}
});
//删除留言确认
$('.comment_del_mark').live('click' , function(){
var url = $(this).attr('url');
asyncbox.confirm('删除留言','确认', function(action){
if(action == 'ok')
{
location.href = url;
}
});
});
//删除时间确认
$('.del_article_id').click(function(){
var delurl = $(this).attr('delurl');
asyncbox.confirm('删除文章','确认', function(action){
if(action == 'ok')
{
location.href = delurl;
}
});
});
/*
//字数限制
$('#rmsg, #reply').live('keyup', function(){
var id = $(this).attr('id');
var left = Util.calWbText($(this).val(), 500);
var eid = '#errmsg';
if(id == 'reply') eid = '#rerrmsg';
if (left >= 0)
$(eid).html('您还可以输入<span>' + left + '</span>字');
else
$(eid).html('<font color="red">您已超出<span>' + Math.abs(left) + '</span>字 </font>');
});
*/
//加载表情
$('#face').qqFace({id : 'facebox1', assign : 'reply', path : '/image/qqface/'});
$('#mface').qqFace({id : 'facebox', assign : 'rmsg', path:'/image/qqface/'});
/*
$('#class_one_id').change(function(){
alert(123213);
var id = parseInt($(this).val() , 10);
if(id == 0) return false;
$('.hidden_son_class span').each(function( index , dom ){
if( dom.attr('cid') == id )
{
}
});
});
*/
//转载文章
var turn_url = "/blog/viewClassPart.html";
$('#repost_bar').click(function(){
if(isOnLine == '' )
{
//showErrorMsg('登录之后才能进行此操作' , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
return false;
}
var id = $(this).attr('bid');
asyncbox.open({
id : 'turn_class_thickbox',
url : turn_url,
title : '转载文章',
width : 330,
height : 131,
scroll : 'no',
data : {
'id' : id
},
callback : function(action){
if(action == 'close'){
$.cover(false);
}
}
});
});
/*
//转发文章
$('#repost_bar').live('click' , function(){
if(isOnLine == '' )
{
//showErrorMsg('登录之后才能进行此操作' , '消息提示');
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
return false;
}
var bid = $(this).attr('bid');
var url = $(this).attr('url');
asyncbox.confirm('转载文章','确认', function(action){
if(action == 'ok'){
$.ajax({
type:"POST",
url:url,
data: {
'bid' : bid
},
dataType: 'json',
success:function(msg){
if(msg.error == 0){
showSucceedMsg('转发成功！', '消息提示');
}else if(msg.error == 1){
//location.href = '/index.php?r=site/login';
showErrorMsg('操作失败,您需要先登录!', '消息提示', 'http://account.chinaunix.net/login');
}else{
showErrorMsg(msg.error_content, '消息提示');
}
}
});
}
});
});
*/
});
</script>
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