# String

In PHP, using functions related to strings is quite common, that's why Wolff includes a class with some functions related to strings which can be quite useful.

Just remember to use Utilities\Str.

Sanitize

Sanitize strings is an important thing to do. So the String class have some functions related to it.

Sanitizing an URL:

$url = Str::sanitizeURL($url);
//The function will return the $url variable sanitized

Exactly the same can be applied with the sanitizeEmail, sanitizeInt, sanitizeFloat and sanitizePath functions.

Others

Is email

Returns true if the given string complies with an email format.

Str::isEmail('[email protected]');

That will return true.

Is alphanumeric

Returns true if the given string contains only alphanumeric characters and whitespaces.

Str::isAlphanumeric('abcdefg1234567 890');

That will return true.

Is alpha

Returns true if the given string contains only letters and whitespaces.

Str::isAlpha('abc def g');

That will return true.

Token

Returns a random generated token.

Str::token();

The default length of the token is 16 characters, but it can be changed passing a number as the only one parameter to that method.

Str::token(24);

That will return a token with 24 characters length.

Slug

Returns a url friendly string.

Str::slug(' Hola cómo estás? Bien');

That will return hola-como-estas-bien.

Basically this function replaces special letters by their normal counterpart, puts everything lowercase and replaces the remaining characters with an hyphen -.

Contains

Returns true if a string contains a substring.

Str::contains('Lorem ipsum dolor sit amet', 'sit');

That will return true.

Interpolate

Returns a string with its placeholders replaced by context values.

$values = [
    'first' => 'john',
    'last'  => 'doe'
];

Str::interpolate('Your firstname is {first} and your lastname is {last}', $values);

That will return Your firstname is john and your lastname is doe.

If the given array is empty, the method will return the original string.

swap

Returns a string with the two indicated substrings swapped.

Str::swap("I'm the Alpha, the Omega, everything in between", "Alpha", "Omega");

That will return I'm the Omega, the Alpha, everything in between.

The first parameter is the string, the remaining two are the substrings to be swapped.

toUtf8

Converts a string with any encoding to UTF-8 and returns it.

Keep in mind that the string encoding detection is not perfect.

Str::toUtf8($string);

limit

Returns a truncated string with the specified length.

Str::limit('Lorem ipsum dolor sit amet', '4');

That will return Lore.

unShift

Adds the given value at the start of the string and returns it.

Str::unShift('psum dolor sit amet', 'Lorem i');

That will return Lorem ipsum dolor sit amet.

concat Path

Returns all the given strings and/or arrays of strings concatenated as a path.

Str::concatPath('home', 'public', 'logo.svg');

Str::concatPath(['home', 'public'], 'logo.svg');

Both examples are the same and will return home/public/logo.svg.

concat

Returns all the given strings concatenated into one.

Str::concat('Lorem ', 'ipsum ', 'dolor');

Returns Lorem ipsum dolor.

toString

Returns the given value as a string.

Str::toString(true);
//Returns 'true'

Booleans will be converted to a 'true' or 'false' string.

Arrays will be imploded to a normal string.

Numeric values will be converted to a string using the strval function.

startsWith

Returns true if a string starts with a substring.

Str::startsWith('Lorem ipsum dolor sit amet', 'Lorem');

That will return true.

endsWith

Returns true if a string ends with a substring.

Str::endsWith('Lorem ipsum dolor sit amet', 'amet');

That will return true.

remove

Removes all the ocurrences of a subtring in a string.

The first parameter is the original string, the second is the substring to remove.

Str::remove('Lorem ipsum dolor sit amet', 'sit');

That will return Lorem ipsum dolor amet.

after

Returns everything after the specified substring.

The first parameter is the original string, the second is the substring that will cut it.

Str::after('Lorem ipsum dolor sit amet', 'dolor');

That will return sit amet.

before

Returns everything before the specified substring.

The first parameter is the original string, the second is the substring that will cut it.

Str::before('Lorem ipsum dolor sit amet', 'dolor');

That will return Lorem ipsum.

pathToNamespace

Turns a directory path into a namespace path, it replaces slashes by backslashes.

pathToNamespace('sub/home');

That will return sub\home.

namespaceToPath

Turns a namespace path into a directory path, it replaces backslashes by slashes.

namespaceToPath('sub\home');

That will return sub/home.