ctype_lower - PHP code example

Inbuilt PHP Functions - ctype_lower

There are many inbuilt functions available in php that can be used to perform various tasks. One of these is ctype_lower. This function checks whether a string consists of only lower or upper case alphabetical characters a-z. It returns a boolean value, either True or False. The function can be used in an if-block.

This function is a part of the ctype extension, which is enabled by default if you are using PHP 4.2 or higher. This extension is basically a set of functions that are used to verify that the characters in a given string are correct.

These functions also check for certain types of spaces and special characters like tabs, line breaks, etc. The ctype_space() function, for example, checks if a string consists of whitespace characters. These include blanks and any control character that leaves a space on the page, such as the narrow no-break space or the Mongolian vowel separator.

You can also use the ctype_digit() function to check whether a string consists of digits or not. This can be useful if you are testing a number or a string that is supposed to be a numeric value in hexadecimal notation.

Another inbuilt function that can be used is the ctype_alpha() function, which checks if a string contains only letters or not. This can be useful if a string contains letters, numbers or other characters that do not belong to the alphabet. The function can be used in an if> block.

ctype_lower example

if (!function_exists('ctype_cntrl')) {
    function ctype_cntrl(mixed $text): bool { return p\Ctype::ctype_cntrl($text); }
}
if (!function_exists('ctype_digit')) {
    function ctype_digit(mixed $text): bool { return p\Ctype::ctype_digit($text); }
}
if (!function_exists('ctype_graph')) {
    function ctype_graph(mixed $text): bool { return p\Ctype::ctype_graph($text); }
}
if (!function_exists('ctype_lower')) {
    function ctype_lower(mixed $text): bool { return p\Ctype::ctype_lower($text); }
}
if (!function_exists('ctype_print')) {
    function ctype_print(mixed $text): bool { return p\Ctype::ctype_print($text); }
}
if (!function_exists('ctype_punct')) {
    function ctype_punct(mixed $text): bool { return p\Ctype::ctype_punct($text); }
}
if (!function_exists('ctype_space')) {
    function ctype_space(mixed $text): bool { return p\Ctype::ctype_space($text); }
}
if (!function_exists('ctype_upper')) {

    $edit = [];
    $edit['path[0][value]'] = '/node/' . $node1->id();
    $edit['alias[0][value]'] = '/' . $this->getRandomGenerator()->word(8);
    $this->drupalGet('admin/config/search/path/add');
    $this->submitForm($edit, 'Save');

    // Confirm that the alias works.     $this->drupalGet($edit['alias[0][value]']);
    $this->assertSession()->pageTextContains($node1->label());
    $this->assertSession()->statusCodeEquals(200);
    // Confirm that the alias works in a case-insensitive way.     $this->assertTrue(ctype_lower(ltrim($edit['alias[0][value]'], '/')));
    $this->drupalGet($edit['alias[0][value]']);
    // Lower case.     $this->assertSession()->pageTextContains($node1->label());
    $this->assertSession()->statusCodeEquals(200);
    $this->drupalGet(mb_strtoupper($edit['alias[0][value]']));
    // Upper case.     $this->assertSession()->pageTextContains($node1->label());
    $this->assertSession()->statusCodeEquals(200);

    // Change alias to one containing "exotic" characters.     $pid = $this->getPID($edit['alias[0][value]']);

if (!function_exists('ctype_cntrl')) {
    function ctype_cntrl($text) { return p\Ctype::ctype_cntrl($text); }
}
if (!function_exists('ctype_digit')) {
    function ctype_digit($text) { return p\Ctype::ctype_digit($text); }
}
if (!function_exists('ctype_graph')) {
    function ctype_graph($text) { return p\Ctype::ctype_graph($text); }
}
if (!function_exists('ctype_lower')) {
    function ctype_lower($text) { return p\Ctype::ctype_lower($text); }
}
if (!function_exists('ctype_print')) {
    function ctype_print($text) { return p\Ctype::ctype_print($text); }
}
if (!function_exists('ctype_punct')) {
    function ctype_punct($text) { return p\Ctype::ctype_punct($text); }
}
if (!function_exists('ctype_space')) {
    function ctype_space($text) { return p\Ctype::ctype_space($text); }
}
if (!function_exists('ctype_upper')) {