php截取指定字符串之间的字符串的类

<?php
class get_c_str {
var $str;
var $start_str;
var $end_str;
var $start_pos;
var $end_pos;
var $c_str_l;
var $contents;
function get_str($str,$start_str,$end_str){
$this->str = $str;
$this->start_str = $start_str;
$this->end_str = $end_str;
$this->start_pos = strpos($this->str,$this->start_str)+strlen($this->start_str);

 $this->end_pos = strpos($this->str,$this->end_str);

$this->c_str_l = $this->end_pos - $this->start_pos;
$this->contents = substr($this->str,$this->start_pos,$this->c_str_l);
return $this->contents;
}
}
?>

用法:
<?php
$get_c_str = new get_c_str;
echo $get_c_str -> get_str('[123456789]','[',']');
?>

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