How to automatically generate forms in PHP

This article mainly introduces the method of automatically generating forms in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

In the process of PHP development, we sometimes encounter situations where the form is not fixed and needs to be dynamically generated during the running of the program. Here is a class for PHP to automatically create a form for everyone

Form.php

<?php
//Form.php
class form {
    var $layout=true;//是否使用表格布局
    var $action;//表单要提交到的URL
    var $method;
    var $enctype="";
    var $name="";
    var $id="";
    var $class="";
    function form($action,$method="POST"){  //通过构造函数初始化成员变量
        $this->action=$action;
        $this->method=$method;
    }
    function form_start(){
        $text="<form action=\"{$this->action}\" method=\"{$this->method}\"";
        if($this->class!==""){
            $text.=" class=\"{$this->class}\"";
        }
        if ($this->enctype!=="") {
            $text.=" enctype=\"{$this->enctype}\"";
        }
        if($this->id!==""){
            $text.=" id=\"{$this->id}\"";
        }
        if($this->name!==""){
            $text.=" name=\"{$this->name}\"";
        }
        $text.=">\n";
        if($this->layout==true){
            $text.="<table>\n";
        }
        return $text;
    }
    function form_end(){
        if ($this->layout==true) {
            $text="\t</table>\n";
            $text.="</form>\n";
        }else {
            $text="</form>\n";
        }
        return $text;
    }
    //文本框函数
    function form_text($name,$id,$label_name,$label_for,$value=""){
        $text="<input type=\"text\" name=\"{$name}\" ";
        $text.="id=\"{$id}\" ";
        if(isset($value)){
            $text.="value=\"{$value}\" ";
        }
        $text.="/>\n";
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //密码框函数
    function form_passwd($name,$id,$label_name,$label_for,$value=""){
        $text="<input type=\"password\" name=\"{$name}\" ";
        $text.="id=\"{$id}\" ";
        if(isset($value)){
            $text.="value=\"{$value}\" ";
        }
        $text.="/>\n";
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //隐藏域函数
    function form_hidden($name,$id,$label_name,$label_for,$value=""){
        $text="<input type=\"hidden\" name=\"{$name}\" id=\"{$id}\" ";
        if(isset($value)){
            $text.="value=\"{$value}\" ";
        }
        $text.="/>\n";
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //文件域函数
    function form_file($name,$id,$label_name,$label_for,$size=""){
        $text="<input type=\"file\" name=\"{$name}\" ";
        $text.="id=\"{$id}\" ";
        if(isset($size)){
            $text.="size=\"{$size}\" ";
        }
        $text.="/>\n";
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //复选框函数
    function form_checkbox($name,$label=array(),$label_name,$label_for=""){
        $i=0;
        $text=array();
        foreach ($label as $id=>$value){
            $text[$i]="<input type=\"checkbox\" id=\"{$id}\" name=\"{$name}\" value=\"{$value}\" />";
            $text[$i].="<label for=\"{$id}\">{$value}</label>";
            $i++;
        }
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //单选框函数
    function form_radio($name,$label=array(),$label_name,$label_for=""){
        $i=0;
        $text=array();
        foreach ($label as $id=>$value){
            $text[$i]="<input type=\"radio\" id=\"{$id}\" name=\"{$name}\" value=\"{$value}\" />";
            $text[$i].="<label for=\"{$id}\">{$value}</label>";
            $i++;
        }
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //下拉菜单函数
    function form_select($id,$name,$options=array(),$selected=false,$label_name,$label_for,$onchange=""){
        if($onchange!==""){
            $text="<select id=\"{$id}\" name=\"{$name}\" onchang=\"{$onchange}\">\n";
        }
        else{
            $text="<select id=\"{$id}\" name=\"{$name}\">\n";
        }
        foreach ($options as $value=>$key){
            if($selected==$value){
                $text.="\t<option valute=\"{$value}\" selected=\"selected\">{$key}</option>\n";
            }elseif ($selected===false) {            
                $text.="\t<option value=\"{$value}\">{$key}</option>\n";
            }
        }
        $text.="</select>";
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //多选列表函数
    function form_selectmul($id,$name,$size,$options=array(),$label_name,$label_for){
        $text="<select id=\"{$id}\" name=\"{$name}\" size=\"{$size}\" multiple=\"multiple\">\n";
        foreach ($options as $value=>$key){
            $text.="\t<option value=\"{$value}\">{$key}</option>\n";
        }
        $text.="</select>\n";
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //按钮函数
    function form_button($id,$name,$type,$value,$onclick=""){
        $text="<button id=\"{$id}\" name=\"{$name}\" type=\"{$type}\"";
        if($onclick!==""){
            $text.=" onclick=&#39;{$onclick}&#39;";
        }
        $text.=">".$value;
        $text.="</button>\n";
        if($this->layout==true){
            $form_item="<tr>\n\t<th> </th><td>{$text}</td>\n</tr>\n";
        }else {
            $form_item=$text;
        }
        return $form_item;
    }
    //文本域函数
    function form_textarea($id,$name,$cols,$rows,$label_name,$label_for,$value=""){
        $text="<textarea id=\"{$id}\" name=\"{$name}\" cols=\"{$cols}\" rows=\"{$rows}\">{$value}</textarea>\n";
        $label=$this->form_label($label_name,$label_for);
        $form_item=$this->form_item($label,$text);
        return $form_item;
    }
    //文字标签函数
    function form_label($text,$for){
        if($for!==""){
            $label="<label for=\"{$for}\">{$text}：</label>";
        }else {
            $label=$text."：";
        }
        return $label;
    }
    function form_item($form_label,$form_text){
        switch ($this->layout){
            case true:
                $text="<tr>\n";
                $text.="\t<th class=\"label\">";
                $text.=$form_label;
                $text.="</th>\n";
                $text.="\t<td>";
                $text.=$form_text;
                $text.="</td>\n";
                $text.="</tr>\n";
                break;
            case false:
                $text=$form_label;
                $text.=$form_text;
                break;
        }
        return $text;
    }
    function CreateForm($form_item=array()){
        echo $this->form_start();
        foreach ($form_item as $item){
            echo $item;
        }
        echo $this->form_end();
    }
}
?>

Usage example:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh" lang="zh">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <link rel="stylesheet" type="text/css" href="css/styles.css" />
    <title>用户登录</title>
</head>
<body>
<?php
require_once("form.php");
$form=new form($_SERVER[&#39;PHP_SELF&#39;]);   //提交到本页
$form->layout=false;                   //不使用表格布局，大家可以把这句注释掉看结果有何不同
$name=$form->form_text("userid","userid","用户名","userid");
$passwd=$form->form_passwd("passwd","passwd","密码","passwd");
$submit=$form->form_button("","submit","submit","登录");
$form_item=array($name,$passwd,$submit);
$form->CreateForm($form_item);
?>
</body>
</html>

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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