PHP Regular method of judging mobile phone number

When using regular matching mobile phone number, we first analyze the law of mobile phone number:

1. Mobile phone number is usually 11-bit

2. Often the beginning of 1

3. The second figure is usually 34578 of these figures, the mobile phone number for the 170th segment of 2014.5.5 is on sale so there is a 7 more.

PHP uses regular expressions to determine how a mobile phone number is written:

1. $g = "/^1[34578]\d{9}$/";
   The "^" symbol indicates that the 1 must be the beginning; "[]" means that the second digit must be a number in brackets; The \d represents 0-9 arbitrary numbers, followed by {9}, which indicates a length of 9 digits; The following $ represents the end; The start and end/regular expressions must be placed in the middle, and some may also follow the pattern.

This can be written by matching all the phone numbers in the article:

1. $str = ' Old Bar blog author's cell phone is 18912345678 ';
2. Preg_match_all ("/^1[34578]\d{9}$/", $str, $mobiles);
3. Var_dump ($mobiles);

If you want to check whether the phone number entered by the user is correct, you can check this:

1. if (Preg_match ("/^1[34578]\d{9}$/", $mobile)) {
2. There's an infinite imagination here.
3. }

PHP Regular method of judging mobile phone number