Find out how many lines will text occupy
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Wed. Mar. 22nd, 2006 6:10 PM
This function calculates how many lines will text occupy.
Example (simple):
$string = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Phasellus tincidunt posuere dolor";
$num_lines = how_many_lines(10, $string);
It accepts a third, optional, parameter $options, that allows you to change behaviour. $options should be array. Following configuration options are available:
'white_spaces' - default: array(' ', "\t") - array of chars, that should be treated as whitespace.
'new_lines' - default: array("\r\n", "\n") - array of strings, that should be treated as newlines. For example, for HTML you can set 'new_lines' => array('');
'force_line_breaks' - default: true - force wrapping, when the token is longer than width, or not. If set to false, and token cannot be fitted into $width, function will return false;
'callback' - default: null - callback function for determining character width. Must accept at least one parameter - $char
'callback_params' - default: array() - optional additional callback parameters
'char_widths' - default: null - associative array in a form $char => $width, which contains char width. If $char is not found in the array, it's width is defaulted to 0.
Example (simple):
$string = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Phasellus tincidunt posuere dolor";
$num_lines = how_many_lines(10, $string);
It accepts a third, optional, parameter $options, that allows you to change behaviour. $options should be array. Following configuration options are available:
'white_spaces' - default: array(' ', "\t") - array of chars, that should be treated as whitespace.
'new_lines' - default: array("\r\n", "\n") - array of strings, that should be treated as newlines. For example, for HTML you can set 'new_lines' => array('');
'force_line_breaks' - default: true - force wrapping, when the token is longer than width, or not. If set to false, and token cannot be fitted into $width, function will return false;
'callback' - default: null - callback function for determining character width. Must accept at least one parameter - $char
'callback_params' - default: array() - optional additional callback parameters
'char_widths' - default: null - associative array in a form $char => $width, which contains char width. If $char is not found in the array, it's width is defaulted to 0.
PHP
<?
function how_many_lines($width, $string, $options = array()) {
if (!is_array($options)) $options = array();
if ($width < 1) {
trigger_error('Width should be > 0');
return false;
}
$default_options = array(
'white_spaces' => array(' ', "\t"),
'new_lines' => array("\r\n", "\n"),
'force_line_breaks' => true,
'callback' => null,
'callback_params' => array(),
'char_widths' => null,
);
extract(array_merge($default_options, $options));
if ($callback == null) {
if ($char_widths != null) {
$callback = create_function('$char, $char_map', 'return (isset($char_map[$char]) ? $char_map[$char] : 0);');
$callback_params = array($char_widths);
} else {
$callback = create_function('$char', 'return 1;');
}
}
$string = str_replace($new_lines, "\n", $string);
$string = str_replace($white_spaces, ' ', $string);
$str_length = strlen($string);
if ($str_length > 0 && $string[$str_length-1] == "\n") {
$str_length--;
}
$sep = -1;
$pos = $j = $line_length = 0;
$number_of_lines = 1;
while ($pos < $str_length) {
$char = $string[$pos];
if ($char == "\n") {
$number_of_lines++;
$pos++;
$sep = -1;
$j = $pos;
$line_length = 0;
} else {
if ($char == ' ') {
$sep = $pos;
}
$line_length += call_user_func_array($callback, array_merge(array($char), $callback_params));
if ($line_length > $width) {
if ($sep == -1) {
if (!$force_line_breaks) {
return false;
} else {
if ($pos == $j) {
$pos++;
}
}
} else {
$pos = $sep + 1;
}
$sep = -1;
$j = $pos;
$line_length = 0;
$number_of_lines++;
} else {
$pos++;
}
}
}
return $number_of_lines;
}
?>
<?
function how_many_lines($width, $string, $options = array()) {
if (!is_array($options)) $options = array();
if ($width < 1) {
trigger_error('Width should be > 0');
return false;
}
$default_options = array(
'white_spaces' => array(' ', "\t"),
'new_lines' => array("\r\n", "\n"),
'force_line_breaks' => true,
'callback' => null,
'callback_params' => array(),
'char_widths' => null,
);
extract(array_merge($default_options, $options));
if ($callback == null) {
if ($char_widths != null) {
$callback = create_function('$char, $char_map', 'return (isset($char_map[$char]) ? $char_map[$char] : 0);');
$callback_params = array($char_widths);
} else {
$callback = create_function('$char', 'return 1;');
}
}
$string = str_replace($new_lines, "\n", $string);
$string = str_replace($white_spaces, ' ', $string);
$str_length = strlen($string);
if ($str_length > 0 && $string[$str_length-1] == "\n") {
$str_length--;
}
$sep = -1;
$pos = $j = $line_length = 0;
$number_of_lines = 1;
while ($pos < $str_length) {
$char = $string[$pos];
if ($char == "\n") {
$number_of_lines++;
$pos++;
$sep = -1;
$j = $pos;
$line_length = 0;
} else {
if ($char == ' ') {
$sep = $pos;
}
$line_length += call_user_func_array($callback, array_merge(array($char), $callback_params));
if ($line_length > $width) {
if ($sep == -1) {
if (!$force_line_breaks) {
return false;
} else {
if ($pos == $j) {
$pos++;
}
}
} else {
$pos = $sep + 1;
}
$sep = -1;
$j = $pos;
$line_length = 0;
$number_of_lines++;
} else {
$pos++;
}
}
}
return $number_of_lines;
}
?>
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{
$lines = explode( "\n", wordwrap( $string, $width, "\n", true ) );
return count( $lines );
}