mmstrlen.php

<?php
function mmstrlen($str) {
  $standalones = array("ဤ", "၍", "ဪ", "၏", "၊", "။", "၌");
  $consonants = array("က", "ခ", "ဂ", "ဃ", "င", "စ", "ဆ", "ဇ", "ဈ", "ည", "ဍ", "ဌ", "ဋ", "ဎ", "ဏ", "တ", "ထ", "ဒ", "ဓ", "န", "ပ", "ဖ", "ဗ", "ဘ", "မ", "ယ", "ရ", "လ", "ဝ", "သ", "ဟ", "ဠ", "အ");
  $numbers = array("၀", "၁", "၂", "၃", "၄", "၅", "၆", "၇", "၈", "၉");

  $len = mb_strlen($str, "UTF-8");
  $count = 0;
  
  for($i = 0; $i < $len; $i++) {
    $char = mb_substr($str, $i, 1, "UTF-8");
    
    if(!burmese($char)) {
      $count++;
    } else {
    
      if(in_array($char, $consonants) || 
        in_array($char, $standalones) ||
        in_array($char, $numbers) || $char == " ") $count++;
      
      if($char == "်") {
        $prev = mb_substr($str, $i - 1, 1, "UTF-8");
        if(in_array($prev, $consonants)) $count--;
      }
      
    }
  }

  return $count;
}

## Dependencies
function burmese($char) {
  return utf82uni($char) >= 0x1000 and utf82uni($char) <= 0x109f;
}

// Convert UTF-8 string to Unicode hex values
function utf82uni($str) {
  $unicode = array();        
  $values = array();
  $lookingFor = 1;

  for ($i = 0; $i < strlen( $str ); $i++ ) {
    $thisValue = ord( $str[ $i ] );
  if ( $thisValue < ord('A') ) {
    // exclude 0-9
    if ($thisValue >= ord('0') && $thisValue <= ord('9')) {
       // number
       $unicode[] = chr($thisValue);
    }
    else {
       $unicode[] = '%'.dechex($thisValue);
    }
  } else {
      if ( $thisValue < 128) 
    $unicode[] = $str[ $i ];
      else {
        if ( count( $values ) == 0 ) $lookingFor = ( $thisValue < 224 ) ? 2 : 3;                
        $values[] = $thisValue;                
        if ( count( $values ) == $lookingFor ) {
          $number = ( $lookingFor == 3 ) ?
            ( ( $values[0] % 16 ) * 4096 ) + ( ( $values[1] % 64 ) * 64 ) + ( $values[2] % 64 ):
            ( ( $values[0] % 32 ) * 64 ) + ( $values[1] % 64 );
      $number = dechex($number);
      $unicode[] = (strlen($number)==3)?"0x0".$number:"0x".$number;
          $values = array();
          $lookingFor = 1;
      } // if
    } // if
  }
  } // for
  return implode("",$unicode);
}