(PECL haru >= 0.0.1)
HaruFont::measureText — Calculate the number of characters which can be included within the specified width
$text
   , float $width
   , float $font_size
   , float $char_space
   , float $word_space
   [, bool $word_wrap = false
  ] )Calculate the number of characters which can be included within the specified width.
text
     The text to fit the width.
width
     The width of the area to put the text to.
font_size
     The size of the font.
char_space
     The character spacing.
word_space
     The word spacing.
word_wrap
     
       When this parameter is set to TRUE the function "emulates" word
       wrapping and doesn't include the part of the current word if reached
       the end of the area.
      
Returns the number of characters which can be included within the specified width.
Throws a HaruException on error.