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<?php $strings = array('string1' => "\n\r\t", 'string2' => "\narf12", 'string3' => '\n\r\t'); foreach ($strings as $name => $testcase) { if (ctype_space($testcase)) { echo "The string '$name' consists of all whitespace characters.\n"; } else { echo "The string '$name' does not consist of all whitespace characters.\n"; } }
Output for 5.6.0 - 7.2.6
The string 'string1' consists of all whitespace characters. The string 'string2' does not consist of all whitespace characters. The string 'string3' does not consist of all whitespace characters.