Example sharing of PHP specifying interception of Chinese, English or numeric characters in a string, _PHP tutorial

Sharing examples of PHP specifying interception of Chinese, English or numeric characters in strings.

During the development process, we often encounter problems such as interception of Chinese and English digits. Everyone We know that Chinese characters and English numbers are different; then we will write some daily functions in the common of the project, including time calculation conversion and Chinese and English character interception functions; for example, the interception function for Chinese and English only has a few lines of code I’m afraid I can’t get it down, so I’m going to tell you a simple one (that I’ve run locally). If you have any questions, please give me some advice

$c = 'ddaabbccaa';
$d = '地球需要我们每个人的爱护';
 
$frist1 = mb_substr( $c, 0, 1 ,"UTF-8"); // d
$delete_last1 = mb_substr($d, -1,1,"UTF-8");  // 护
echo $frist1.'+++'.$delete_last1.'<br/>'; // d+++护
 
$frist2 = mb_substr( $d, 0, 1 ,"UTF-8"); // 地
$delete_last2 = mb_substr($d, -1,1,"UTF-8");  // 护
echo $frist2.'+++'.$delete_last2.'<br/>'; // 地+++护
 
$e = '11aa22cc33';
$f = 'aa地球需要我们每个人的爱护';
$g = '地球需要我们每个人的爱护gg';
$h = '地球需要我们每个人的爱护';
$first3 = mb_substr( $e, 0, 1 ,"UTF-8"); // 1
$last3 = mb_substr( $f, 0, 1 ,"UTF-8"); // a
$delete_last3 = mb_substr($f, -1,1,"UTF-8");  // 护
$delete_last4 = mb_substr($g, -1,1,"UTF-8");  // g
$frist4 = mb_substr( $g, 0, 1 ,"UTF-8");    // 地
$delete_last5 = mb_substr($h, -1,1,"UTF-8");  // 护
 
echo $first3.'+++'.$last3.'---'.$delete_last3.'***'.$delete_last4.'&&&'.$frist4.'<br/>'; // 1+++a---护***g&&&地
echo $last3.'...'.$delete_last3.'<br/>';  // a...护
echo $frist4.'...'.$delete_last5.'<br/>'; // 地...护
// 这样不管字符串里是中英文数字等都是可以的无需判断，如:  ”地...护“ 或者 “地...” 或者 “...护”

PS: How to filter spaces in strings

How to remove Chinese and English spaces at the beginning and end of a string:

function mbTrim($str)  
{  
  return mb_ereg_replace('(^(　| )+|(　| )+$)', '', $str);  
} 

The following regular validation filters out the consecutive spaces entered by the user, including full-width spaces and half-width spaces

$user = mb_ereg_replace('^(　| )+', '', $user);
$user = mb_ereg_replace('(　| )+$', '', $user);

$age = mb_ereg_replace('^(　| )+', '', $age);
$age = mb_ereg_replace('(　| )+$', '', $age); 

$method = mb_ereg_replace('^(　| )+', '', $method);
$method = mb_ereg_replace('(　| )+$', '', $method);

$address = mb_ereg_replace('^(　| )+', '', $address);
$address = mb_ereg_replace('(　| )+$', '', $address); 

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