PHP real-time statistics on the number of Chinese characters and differences

1. How to correctly count the number of Chinese characters in PHP? This is a problem that has troubled me for a long time. There are many functions in PHP that can calculate the length of a string. For example, in the following example, we use strlen, mb_strlen, and mb_strwidth respectively to test the length of the string and see how many bytes of Chinese are counted:

echo strlen("Hello ABC") . "";
# Output 9echo mb_strlen("Hello ABC", 'UTF-8') . "";
# Output 5echo mb_strwidth("Hello ABC") . "";
#Output 7

From the above test, we can see that strlen counts Chinese characters into 3 bytes, mb_strlen doesn't care

</script> Whether Chinese or English is 1 byte, while mb_strwidth calculates Chinese as 2 bytes, so mb_strwidth is what we want: 2 bytes in Chinese and 1 byte in English.

It is also recommended to use mb_strimwidth to intercept strings, which is calculated according to the 2 bytes in Chinese and 1 byte in English. If the number of words exceeds the intercept requirements, this function can also automatically add '...' at the end.

mb_strimwidth($post_excerpt,0,240,'...','utf-8');

Note that adding the 'utf-8' encoding parameter in the end can avoid the problem of garbled code interception in Chinese.

2、

<script type="text/javascript">
  var len = $('#Form-field-Course-description').text().length;
  $('#Form-field-Course-description-group').append('<div  style="position: absolute;right: -50px;bottom: 18px;"></div>');
  var len=$('#Form-field-Course-description').val().length;
  $('#txtNum').text(len+"/500");
  $('#Form-field-Course-description').bind('input propertychange', function() {
     var val=$(this).val();
     var len=;
     if(len>500){
      len=500;
      $(this).val((0,500));
     }
    $('#txtNum').text(len+"/500");
  });
</script>

Obtain the textarea length according to Octobercms background update, listen to the event through input and propertychange event

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