w3resource

PHP: wordwrap() function

Description

The  wordwrap() function is used to wraps a string to a given number of characters. Wraps a string to a given number of characters using a string break character.

Version:

(PHP 4 and above)

Syntax:

string wordwrap ( string $str [, int $width = 75 [, string $break = "\n" [, bool $cut = false ]]] )

Parameter:

Name Description Required /
Optional		 Type
str The input string. Required String
width The number of characters at which the string will be wrapped. Required String
break The line is broken using the optional break parameter. Required String
cut If the cut is set to TRUE, the string is always wrapped at or before the specified width. So if you have a word that is larger than the given width, it is broken apart. (See second example). When FALSE the function does not split the word even if the width is smaller than the word width. Required String

Return values:

Returns the given string wrapped at the specified length.

Value Type: String.

Pictorial Presentation:

Example: 

<?php
  $text = "The quick brooooooooooooooooooown fox jumps over the lazy dog.";
  $newtext = wordwrap($text, 8, "\n", false);
echo "$newtext\n";
?>

Output:

The
quick
brooooooooooooooooooown
fox
jumps
over the
lazy
dog.

View the example in the browser

See also

PHP Function Reference

Previous: vprintf
Next: Installing and configuring PHP Variable Handling



PHP: Tips of the Day

PHP - How do I implement a callback in PHP?

The manual uses the terms "callback" and "callable" interchangeably, however, "callback" traditionally refers to a string or array value that acts like a function pointer, referencing a function or class method for future invocation. This has allowed some elements of functional programming since PHP 4. The flavors are:

$cb1 = 'someGlobalFunction';
$cb2 = ['ClassName', 'someStaticMethod'];
$cb3 = [$object, 'somePublicMethod'];

// this syntax is callable since PHP 5.2.3 but a string containing it
// cannot be called directly
$cb2 = 'ClassName::someStaticMethod';
$cb2(); // fatal error

// legacy syntax for PHP 4
$cb3 = array(&$object, 'somePublicMethod');

This is a safe way to use callable values in general:

if (is_callable($cb2)) {
    // Autoloading will be invoked to load the class "ClassName" if it's not
    // yet defined, and PHP will check that the class has a method
    // "someStaticMethod". Note that is_callable() will NOT verify that the
    // method can safely be executed in static context.

    $returnValue = call_user_func($cb2, $arg1, $arg2);
}

Modern PHP versions allow the first three formats above to be invoked directly as $cb(). call_user_func and call_user_func_array support all the above.

Notes/Caveats:

  1. If the function/class is namespaced, the string must contain the fully-qualified name. E.g. ['Vendor\Package\Foo', 'method']
  2. call_user_func does not support passing non-objects by reference, so you can either use call_user_func_array or, in later PHP versions, save the callback to a var and use the direct syntax: $cb();
  3. Objects with an __invoke() method (including anonymous functions) fall under the category "callable" and can be used the same way, but I personally don't associate these with the legacy "callback" term.
  4. The legacy create_function() creates a global function and returns its name. It's a wrapper for eval() and anonymous functions should be used instead.

Ref : https://bit.ly/2Zmqil0