The trinocular operation is compiled into an if statement. What to do with it

Source: Internet
Author: User
The trinocular operation is compiled into an if statement ...
And the red one, what's the concept?

$KEYC = $ckey _length? ($operation = = ' DECODE '? substr ($string, 0, $ckey _length): substr (MD5 (Microtime ()),-$ckey _length)): ";



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The 2nd parameter of the SUBSTR function is turned over the manual. Where to start the interception
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And the red one, what's the concept?

$KEYC = $ckey _length? ($operation = = ' DECODE '? substr ($string, 0, $ckey _length): substr (MD5 (Microtime ()),-$ckey _length)): ";

------Solution--------------------
PHP Code
if ($ckey _length) {    if ($operation = = ' DECODE ') {        $keyc =substr ($string, 0, $ckey _length);    } else{        $KEYC =substr (MD5 (Microtime ()),-$ckey _length);}    } else{    
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