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php »ñÈ¡Êý×éÖµ Êý×éµßµ¹ ¼üÃû²Ù×÷ÊµÀý_PHP教程

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Jul 20, 2016 am 11:01 AM

aarraycolorGoldphpprintresetsize

ÏÂÃæ¾ÙÁË¼¸¸öÊµÀýÖ÷ÒªÊÇ½²¹ØÓÚÊä³öÊý×éËùÓÐµÄÖµ array_values ,Ñ»·Êä³öÊý×éµÄ¼ü/Öµ¶Ô²¢ÒÆ¶¯Ö¸Õë reset,½«Êý×éµßµ¹£¬²»±£Áô¼üÃûarray_reverseº¯Êý²Ù×÷¡£

ÏÂÃæ¾ÙÁË¼¸¸öÊµÀýÖ÷ÒªÊÇ½²¹ØÓÚÊä³öÊý×éËùÓÐµÄÖµ array_values ,Ñ»·Êä³öÊý×éµÄ¼ü/Öµ¶Ô²¢ÒÆ¶¯Ö¸Õë reset,½«Êý×éµßµ¹£¬²»±£Áô¼üÃûarray_reverseº¯Êý²Ù×÷¡£
*/

$array=array("size"=>"xl","color"=>"gold"); //¶¨ÒåÒ»¸öÊý×é
print_r(array_values($array)); //Êä³öÊý×éËùÓÐµÄÖµ

/*
¶¨ÒåºÍÓÃ·¨
array_values() º¯Êý·µ»ØÒ»¸ö°üº¬¸ø¶¨Êý×éÖÐËùÓÐ¼üÖµµÄÊý×é£¬µ«²»±£Áô¼üÃû¡£

Óï·¨
array_values(array)
*/

$fruit=array('a'=>'apple','b'=>'banana','c'=>'cranberry'); //¶¨ÒåÒ»¸öÊý×é
reset($fruit);         //Ö¸ÕëÒÆ¶¯µÚÒ»¸öÎ»ÖÃ
while(list($key,$val)=each($fruit))     //Ñ»·Êä³öÊý×éµÄ¼ü/Öµ¶Ô²¢ÒÆ¶¯Ö¸Õë
{
echo "$key=>$valn";       //Êä³öÊý×éµÄ¼ü¼°Öµ
}

$input=array("php½Ì³Ì",3.0,array("green","red"));    //¶¨ÒåÒ»¸öÊý×é
$result=array_reverse($input);       //½«Êý×éµßµ¹£¬²»±£Áô¼üÃû
$result_keyed=array_reverse($input,true);    //½«Êý×éµßµ¹£¬±£Áô¼üÃû
print_r($result);          //ÏÔÊ¾µÚÒ»ÖÖ½á¹û
print_r($result_keyed);        //ÏÔÊ¾µÚ¶þÖÖ½á¹û

/*
¶¨ÒåºÍÓÃ·¨
array_reverse() º¯Êý½«ÔÊý×éÖÐµÄÔªËØË³Ðò·×ª£¬´´½¨ÐÂµÄÊý×é²¢·µ»Ø¡£Èç¹ûµÚ¶þ¸ö²ÎÊýÖ¸¶¨Îª true£¬ÔòÔªËØµÄ¼üÃû±£³Ö²»±ä£¬·ñÔò¼üÃû½«¶ªÊ§¡£

Óï·¨
array_reverse(array,preserve)
*/

$array=array(0=>100,"color"=>"red");      //¶¨ÒåÒ»¸öÊý×é
print_r(array_keys($array));        //·µ»Ø¸ÃÊý×éµÄËùÓÐ¼üÃû
$array=array("blue","red","green","blue","blue");     //¶¨ÒåÒ»¸öÊý×é
print_r(array_keys($array,"blue"));       //·µ»ØÖµÎªblueµÄ¼üÃû
//¶¨ÒåÒ»¸öÔªËØÎªÊý×éµÄÊý×é
$array=array("color"=>array("blue","red","green"),"size"=>array("small","medium","large"));
print_r(array_keys($array));        //·µ»ØÊý×éµÄËùÓÐ¼üÃû

/*
¶¨ÒåºÍÓÃ·¨
array_keys() º¯Êý·µ»Ø°üº¬Êý×éÖÐËùÓÐ¼üÃûµÄÒ»¸öÐÂÊý×é¡£

Èç¹ûÌá¹©ÁËµÚ¶þ¸ö²ÎÊý£¬ÔòÖ»·µ»Ø¼üÖµÎª¸ÃÖµµÄ¼üÃû¡£

Èç¹û strict ²ÎÊýÖ¸¶¨Îª true£¬Ôò php »áÊ¹ÓÃÈ«µÈ±È½Ï (===) À´ÑÏ¸ñ¼ì²é¼üÖµµÄÊý¾ÝÀàÐÍ¡£

Óï·¨
array_keys(array,value)

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