编码问题

<?php
    session_start();
?>
<style>
    .editTable .label {
        min-width: 80px;
        max-width: 80px;
        text-align: left;
    }
</style>
<table class="editTable">
    <tr>
        <td class="label">昵称/店名</td>
        <td colspan="3">
            <input type="text" name="nickname" data-toggle="topjui-textbox" value="<?php echo $_SESSION['nickname']; ?>" data-options="required:true,width:250,prompt: '输入昵称/店名'">
        </td>
    </tr>
    <tr>
        <td class="label">登录账号</td>
        <td colspan="3">
            <input type="text" name="username" data-toggle="topjui-textbox" value="<?php echo $_SESSION['username']; ?>" data-options="required:true,width:250,prompt: '输入登录账号'">
        </td>
    </tr>
    <tr>
        <td class="label">联系电话</td>
        <td colspan="3">
            <input type="text" name="mobile" data-toggle="topjui-textbox" value="<?php echo $_SESSION['mobile']; ?>" data-options="required:true,width:250,prompt: '输入联系电话'">
        </td>
    </tr>
</table>

function adminInfo() {
    var opts = {
        id: 'infoDialog',
        title: '个人信息',
        width: 450,
        height: 250,
        iconCls: 'fa fa-key',
        href: './html/admin/info_content.php',
        buttons: [{
            text: '确定',
            iconCls: 'fa fa-save',
            btnCls: 'topjui-btn-green',
            handler: function () {
                if ($('#infoDialog').form('validate')) {
                    var formData = $("#infoDialog").serialize();
                    var strs = formData.split("&");
                    for(var i=0,len=strs.length;i<len;i++){
                        strs[i] = strs[i].substring(strs[i].indexOf('=')+1,strs[i].length);
                    }
                    $.iMessager.alert('警告', strs[0]+'/'+strs[1]+'/'+strs[2], 'messager-warning');
                }
            }
        }, {
            text: '关闭',
            iconCls: 'fa fa-close',
            btnCls: 'topjui-btn-red',
            handler: function () {
                $("#infoDialog").iDialog('close');
            }
        }]
    };
    $('#' + opts.id).iDialog('openDialog', opts);
};