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<!DOCTYPE html> <html> <body> <?php echo substr_compare("Hello world!","Hello world!",0)."<br>"; // 两个字符串相等 echo substr_compare("Hello world!","Hello",0)."<br>"; // 字符串1大于字符串2 echo substr_compare("Hello world!","Hello world! Hello!",0)."<br>"; // 字符串1小于字符串2 ?> </body> </html>