explode() 函数把字符串分割为数组。
语法
explode(separator,string,limit)
参数 | 描述 |
---|---|
separator | 必需。规定在哪里分割字符串。 |
string | 必需。要分割的字符串。 |
limit | 可选。规定所返回的数组元素的最大数目。 |
说明
本函数返回由字符串组成的数组,其中的每个元素都是由 separator 作为边界点分割出来的子字符串。
separator 参数不能是空字符串。如果 separator 为空字符串(""),explode() 将返回 FALSE。如果 separator 所包含的值在 string 中找不到,那么 explode() 将返回包含 string 中单个元素的数组。
如果设置了 limit 参数,则返回的数组包含最多 limit 个元素,而最后那个元素将包含 string 的剩余部分。
如果 limit 参数是负数,则返回除了最后的 -limit 个元素外的所有元素。此特性是 PHP 5.1.0 中新增的。
提示和注释
注释:参数 limit 是在 PHP 4.0.1 中加入的。
注释:由于历史原因,虽然 implode() 可以接收两种参数顺序,但是 explode() 不行。你必须保证 separator 参数在 string 参数之前才行。
例子
在本例中,我们将把字符串分割为数组:
$str = "Hello world. It's a beautiful day.";
print_r (explode(" ",$str));
?>
输出:
Array
(
[0] => Hello
[1] => world.
[2] => It's
[3] => a
[4] => beautiful
[5] => day.
)
explode函数实例教程
explode ( string separator, string string [, int limit] )
separator 为空字符串(""),explode() 将返回 FALSE。
如果 separator 所包含的值在 string 中找不到,那么 explode() 将返回包含 string 单个元素的数组。
//explode 实例一
$explode = "aaa,bbb,ccc,ddd,explode,jjjj";
$array = explode( ',' ,$explode );
print_r($array);
/*
结果为
Array
(
[0] => aaa
[1] => bbb
[2] => ccc
[3] => ddd
[4] => explode
[5] => jjjj
)
*/
//我们在处理日期或取得文件扩展名时就可以用explode函数与end函数操作,下面来看实例
$file ="www.jb51.net.gif";
$extArray = explode( '.' ,$file );
$ext = end($extArray);
echo $ext;
/*
输出值为.gif
使用些函数出现的错误提示有
Note: Separator cannot be an empty string. 注意:分割符不可以是空字符串。
要分割的字符串为空
Definition and Usage 未使用分割函数
可能是你设置的分割字符不存在

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