Ask why this php program has an error

Why is this php program wrong. PHPcode $ s2 & quot; make_by_id & quot; echoconvString ($ s1); functionconvString ($ string) {$ arrayexplode (_, $ string); array_walk ($ array, & quot; uc: Why is an error in this php program.

PHP code

  $s2 = "make_by_id";echo convString($s1);function convString($string){    $array = explode('_', $string);    array_walk($array, "ucwords");    return implode('', $array);}

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Warning: Wrong parameter count for ucwords () in E: \ wwwroot \ webtest \ test. php on line 25

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PHP code

$ Arr2 = explode ('_', $ s2); function self_ucwords (& $ p_a, $ p_ B) // you can specify two or three parameters, for more details, see the manual {$ p_a = ucwords ($ p_a); // A parameter} array_walk ($ arr2, 'Self _ ucword'); echo implode ('', $ arr2 );
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$ Array = explode ('_', $ string );

Array_walk ($ array, "ucwords ");


$ Add multiple $ array = array () before array ();