About the array returned by Preg_match_all

I want to use regular expressions to match the HTML

In the label
The regular expression used is #(.*)#

Because the original text of the match is actually a regular form. I want to put a number of matching results into the database separately

But the returned two-dimensional array I don't understand
My understanding is that the result of the first dimension is the result of a normal match, and then the second dimension is matched in one-dimensional result. But actually, the first-dimensional array is the same as the second-dimensional array.

I found a preg_match parameter
Parameter description:
Parameter description
Pattern Regular Expression
Subject needs to match the retrieved object
Matches optional, stores an array of matching results, $matches [0] will contain text that matches the entire pattern, $matches [1] will contain the text that matches the sub-pattern in the first captured parenthesis, and so on

(o.o analogy your sister Ah can not understand AH beginners let everyone)

The code is as follows

  
    星期一星期二星期三星期四星期五星期六星期日第一大节11121314151617第二大节21;22形势与政策（6）
第10周
吕志和礼堂 白文杰24252627第三大节 英语   数学 第四大节   音乐   晚　上       ";function trimall($str)//删除全部空格{    $qian=array(" ","　","\t","\n","\r");$hou=array("","","","","");    return str_replace($qian,$hou,$str);    }$test = trimall($test);$match = "#(.*)#";preg_match_all($match,$test,$TR);print_r($TR);?>

Reply content:

I want to use regular expressions to match the HTML

In the label
The regular expression used is #(.*)#

Because the original text of the match is actually a regular form. I want to put a number of matching results into the database separately

But the returned two-dimensional array I don't understand
My understanding is that the result of the first dimension is the result of a normal match, and then the second dimension is matched in one-dimensional result. But actually, the first-dimensional array is the same as the second-dimensional array.

I found a preg_match parameter
Parameter description:
Parameter description
Pattern Regular Expression
Subject needs to match the retrieved object
Matches optional, stores an array of matching results, $matches [0] will contain text that matches the entire pattern, $matches [1] will contain the text that matches the sub-pattern in the first captured parenthesis, and so on

(o.o analogy your sister Ah can not understand AH beginners let everyone)

The code is as follows

  
    星期一星期二星期三星期四星期五星期六星期日第一大节11121314151617第二大节21;22形势与政策（6）
第10周
吕志和礼堂 白文杰24252627第三大节 英语   数学 第四大节   音乐   晚　上       ";function trimall($str)//删除全部空格{    $qian=array(" ","　","\t","\n","\r");$hou=array("","","","","");    return str_replace($qian,$hou,$str);    }$test = trimall($test);$match = "#(.*)#";preg_match_all($match,$test,$TR);print_r($TR);?>

Excuse me, do you understand this sentence?
$matches [1] will contain text that matches the sub-pattern in the first captured parenthesis, what is the parenthesis?

After understanding, I am reminded that your $matches[0] must be more than $matches[1 "TR this label it?"

preg_match_allIt is not a match to stop, but a match to get all the results. So $matches[0] it is not a string but an array of string. Then each match gets an expression that corresponds to a substring, so [1] is the same.

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