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三目运算求编译成if语句。该如何处理

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2016-06-13 13:31:24874browse

三目运算求编译成if语句。。。
还有红色的-号那是个什么概念?

$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';



------解决方案--------------------
substr 函数的第2个参数 翻翻手册吧. 从哪里开始截取
------解决方案--------------------

探讨
还有红色的-号那是个什么概念?

$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';

------解决方案--------------------
PHP code
if($ckey_length ){
    if ($operation == 'DECODE') {
        $keyc=substr($string, 0, $ckey_length);
    }else{
        $keyc=substr(md5(microtime()), -$ckey_length);
    }
}else{
    $keyc='';
} <div class="clear">
                 
              
              
        
            </div>
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