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<html> <body> <p>The parameter "mode 4" will return a string with all the unused characters. In this example, the characters not used in "Hello World!" are:</p> <?php $str = "Hello World!"; echo count_chars($str,4); ?> </body> </html>
运行结果
<!DOCTYPE html> <html> <body> <p>The parameter "mode 4" will return a string with all the unused characters. In this example, the characters not used in "Hello World!" are:</p> � "#$%&'()*+,-./0123456789:;<=>?@ABCDEFGIJKLMNOPQRSTUVXYZ[]^_`abcfghijkmnpqstuvwxyz{|}~???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? </body> </html>