PHP array and string conversion
Conversion of strings and arrays is often used in the process of program development. PHP mainly uses the explode() function and Implode() function implementation, we will explain it in detail below.
1. Use the explode() function to convert the string into an array
explode() function converts the string into an array according to the specified string or Character (separator) cut.
The syntax format is as follows;
array explode(string separator,string string [,int limit])
Returns an array composed of strings. Each array element is a substring of the specified string string. They are all divided by string separator as boundary points. Separate it. If the limit parameter is set, the returned array contains at most limit elements, and the last element will contain the remainder of the string; if the separator is an empty string (""), the explode() function will return false; if the separator contains The value of is not found in string, then the explode() function will return an array containing a single element of string; if the parameter limit is a negative number, all elements except the last limit element will be returned.
The following example uses the explode() function to separate the "PHP, Chinese, Internet" strings according to ",". The sample code is as follows:
<?php
header("Content-Type:text/html; charset=utf-8");
$str = "PHP、中文、网"; //定义一个字符串
$strs = explode("、","$str"); //应用 explode()函数将字符串转换成数组
print_r($strs); //输出数组元素
?>The output result is:
When developing a voting management system, it is often necessary to add voting options to the voting system in the background as voting content. Next, use the explode() function to distinguish the added voting options with "*", and then use the white loop statement to output the added voting options in the page respectively.
The specific development steps are as follows:
(1) Use development tools to create a new PHP dynamic page and save it as index.php.
(2) Use HTML to mark the design surface, first create a voting form to add voting options, then use the each() function to extract the contents of the global array $_POST, and finally use a while loop to output the voting options content. The code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<!---------------------------------------------定义添加投票表单---------------------------------------------------->
<form name="form1" method="post" action="">
<table width="400" border="1" cellpadding="0" cellspacing="1" bordercolor="#FF9900" bgcolor="#CCFF66">
<tr>
<td width="98" height="120" >添加投票选项：</td>
<td width="223" height="120"><p>
<textarea name="content" cols="30" rows="5" id="content"></textarea>
<br>
<span>注意：每个选项间用*分隔</span></p>
</td>
<td width="61" height="120">
<input type="submit" name="submit" value="提交">
</td>
</tr>
</table>
</form>
</body>
</html>(3) Add a table, and then add the following code in the cells of the table to output the added voting options.
<?php
if($_POST[Submit]!=""){
$content = $_POST[content];
$data = explode("*",$content);
while(list($name,$value)=each($data)){
echo '<input type="checkbox" name="checkbox" value="checkbox">';
echo $value."\n";
}
}
?>(4) Enter the address in the browser, press Enter, enter the content of the voting options, use "*" to separate each option, click "Submit", the running results are as follows
2. Use the implode() function to convert the array into a string
implode() function combines the contents of the array into a new string.
The syntax format is as follows:
string implode(string glue,array pieces)
The parameter glue is a string type, which refers to the separator to be passed in; the parameter piexes is an array type, which refers to the passed array variable name of the elements to be merged. .
Use the implode() function to connect the contents of the array with spaces as delimiters to form a new string. The specific example code is as follows:
<?php
header("Content-Type:text/html; charset=utf-8");
$str=array("PHP" ,"中文","网","网址","www.php.cn");
echo implode(" ",$str); //以空格作为分隔符将数组中的元素组合成一个新的字符串
?>The output result is:
【Related tutorial recommendations】
1. Relevant topic recommendations: "php array (Array)"
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