PHP implements the function of detecting GSM characters in mobile phone text messages

This article mainly introduces the method of PHP checking whether a string contains 7-digit GSM characters. It can realize the function of detecting GSM characters in mobile phone text messages. It is of great practical value. Friends in need can refer to it

The example in this article describes how PHP checks whether a string contains 7-digit GSM characters. The specific analysis is as follows:

The following code checks whether a string contains any 7-bit GSM characters. It is very useful for people working on SMS platforms.

<?php
function check_gsm($str)
{
  $arr = array(
"0x00", "0x01", "0x02", "0x03", "0x04", 
"0x05","0x06","0x07","0x08","0x09",
"0x0A","0x0B","0x0C","0x0D","0x0E","0x0F","0x10","0x11","0x12","0x13",
"0x14","0x15","0x16","0x17","0x18","0x19","0x1A","0x1B","0x1B0A",
"0x1B14","0x1B28","0x1B29","0x1B2F","0x1B3C","0x1B3D","0x1B3E",
"0x1B40","0x1B65","0x1C","0x1D","0x1E","0x1F","0x20","0x21","0x22",
"0x23","0x24","0x25","0x26","0x27","0x28","0x29","0x2A","0x2B","0x2C",
"0x2D","0x2E","0x2F","0x30","0x31","0x32","0x33","0x34","0x35","0x36",
"0x37","0x38","0x39","0x3A","0x3B","0x3C","0x3D","0x3E","0x3F","0x40",
"0x41","0x42","0x43","0x44","0x45","0x46","0x47","0x48","0x49","0x4A",
"0x4B","0x4C","0x4D","0x4E","0x4F","0x50","0x51","0x52","0x53","0x54",
"0x55","0x56","0x57","0x58","0x59","0x5A","0x5B","0x5C","0x5D","0x5E",
"0x5F","0x60","0x61","0x62","0x63","0x64","0x65","0x66","0x67","0x68",
"0x69","0x6A","0x6B","0x6C","0x6D","0x6E","0x6F","0x70","0x71","0x72",
"0x73","0x74","0x75","0x76","0x77","0x78","0x79","0x7A","0x7B","0x7C",
"0x7D","0x7E","0x7F");
  $strl = strlen($str);
  for ($i = 0;$i < $strl; $i++)
  {
    $char = &#39;0x&#39; . bin2hex(substr($str,$i,1));
    $pos = in_array($char,$arr);
    if ($pos == 1)
    {
      $j++;
    }
  }
  if ($j < $strl)
  {
    return false;
  }
  else
  {
    return true;
  }
}
?>

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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