{"id":130,"date":"2007-09-15T09:30:43","date_gmt":"2007-09-15T01:30:43","guid":{"rendered":"http:\/\/learn-house.idv.tw\/?p=130"},"modified":"2010-01-17T19:16:23","modified_gmt":"2010-01-17T11:16:23","slug":"phpforeach","status":"publish","type":"post","link":"https:\/\/learn-house.idv.tw\/?p=130","title":{"rendered":"[PHP]foreach"},"content":{"rendered":"

\u5167\u5bb9\u4f86\u6e90\uff1aLINK <\/a>    (\u6b64\u7bc7\u6587\u7ae0\u50c5\u4f9b\u7ad9\u9577\u5099\u4efd\u53c3\u8003\u7528\uff0c\u56fa\u70ba\u52a0\u5bc6\u6587\u7ae0)
<\/a><\/strong><\/p>\n

PHP 4\uff08\u4e0d\u662f PHP 3\uff09\u5305\u62ec\u4e86 foreach<\/tt> \u7d50\u69cb\uff0c\u548c Perl \u4ee5\u53ca\u5176\u4ed6\u8a9e\u8a00\u5f88\u50cf\u3002\u9019\u53ea\u662f\u4e00\u7a2e\u904d\u6b77\u9663\u5217\u7c21\u4fbf\u65b9\u6cd5\u3002foreach<\/tt> \u50c5\u80fd\u7528\u65bc\u9663\u5217\uff0c\u7576\u8a66\u5716\u5c07\u5176\u7528\u65bc\u5176\u5b83\u8cc7\u6599\u578b\u5225\u6216\u8005\u4e00\u500b\u672a\u521d\u59cb\u5316\u7684\u8b8a\u6578\u6642\u6703\u7522\u751f\u932f\u8aa4\u3002\u6709\u5169\u7a2e\u8a9e\u6cd5\uff0c\u7b2c\u4e8c\u7a2e\u6bd4\u8f03\u6b21\u8981\u4f46\u537b\u662f\u7b2c\u4e00\u7a2e\u7684\u6709\u7528\u7684\u64f4\u5c55\u3002 <\/p>\n

<\/a><\/p>\n\n\n\n
\n
foreach(array_expression as $value) statement
foreach(array_expression as $key => $value) statement<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n
     \u7b2c\u4e00\u7a2e\u683c\u5f0f\u904d\u6b77\u7d66\u5b9a\u7684 array_expression<\/tt> \u9663\u5217\u3002\u6bcf\u6b21\u5faa\u74b0\u4e2d\uff0c\u7576\u524d\u55ae\u5143\u7684\u503c\u88ab\u8ce6\u7d66 $value<\/tt> \u4e26\u4e14\u9663\u5217\u5167\u90e8\u7684\u6307\u91dd\u5411\u524d\u79fb\u4e00\u6b65\uff08\u56e0\u6b64\u4e0b\u4e00\u6b21\u5faa\u74b0\u4e2d\u5c07\u6703\u5f97\u5230\u4e0b\u4e00\u500b\u55ae\u5143\uff09\u3002    <\/p>\n
     \u7b2c\u4e8c\u7a2e\u683c\u5f0f\u505a\u540c\u6a23\u7684\u4e8b\uff0c\u53ea\u9664\u4e86\u7576\u524d\u55ae\u5143\u7684\u9375\u503c\u4e5f\u6703\u5728\u6bcf\u6b21\u5faa\u74b0\u4e2d\u88ab\u8ce6\u7d66\u8b8a\u6578 $key<\/tt>\u3002    <\/p>\n
 <\/p>\n
\n
\n
\u8a3b: <\/strong>       \u7576 foreach<\/tt> \u958b\u59cb\u57f7\u884c\u6642\uff0c\u9663\u5217\u5167\u90e8\u7684\u6307\u91dd\u6703\u81ea\u52d5\u6307\u5411\u7b2c\u4e00\u500b\u55ae\u5143\u3002\u9019\u610f\u5473\u8457\u4e0d\u9700\u8981\u5728 foreach<\/tt> \u5faa\u74b0\u4e4b\u524d\u547c\u53eb reset()<\/strong><\/a>\u3002      <\/p>\n<\/blockquote>\n<\/div>\n
 <\/p>\n
\n
\n
\u8a3b: <\/strong>       \u6b64\u5916\u6ce8\u610f foreach<\/tt> \u6240\u64cd\u4f5c\u7684\u662f\u6307\u5b9a\u9663\u5217\u7684\u4e00\u500b\u62f7\u8c9d\uff0c\u800c\u4e0d\u662f\u8a72\u9663\u5217\u672c\u8eab\u3002\u56e0\u6b64\u5373\u4f7f\u6709 each()<\/strong><\/a> \u7684\u5efa\u69cb\uff0c\u539f\u9663\u5217\u6307\u91dd\u4e5f\u6c92\u6709\u8b8a\uff0c\u9663\u5217\u55ae\u5143\u7684\u503c\u4e5f\u4e0d\u53d7\u5f71\u97ff\u3002       <\/p>\n<\/blockquote>\n<\/div>\n
\n
\n
\u8a3b: <\/strong>      foreach<\/tt> \u4e0d\u652f\u63f4\u7528“@”\u4f86\u7981\u6b62\u932f\u8aa4\u8a0a\u606f\u7684\u80fd\u529b\u3002     <\/p>\n<\/blockquote>\n<\/div>\n
     \u4f60\u53ef\u80fd\u6ce8\u610f\u5230\u4e86\u4ee5\u4e0b\u7684\u4ee3\u78bc\u529f\u80fd\u5b8c\u5168\u76f8\u540c\uff1a     <\/p>\n
<\/a><\/p>\n\n\n\n
\n
reset ($arr);
while (list(, $value) = each ($arr)) {
    echo "Value: $value<br>n";
}

foreach ($arr as $value) {
    echo "Value: $value<br>n";
}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
     \u4ee5\u4e0b\u4ee3\u78bc\u529f\u80fd\u4e5f\u5b8c\u5168\u76f8\u540c\uff1a     <\/p>\n
<\/a><\/p>\n\n\n\n
\n
reset ($arr);
while (list($key, $value) = each ($arr)) {
    echo "Key: $key; Value: $value<br>n";
}

foreach ($arr as $key => $value) {
    echo "Key: $key; Value: $value<br>n";
}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
     \u793a\u7bc4\u7528\u6cd5\u7684\u66f4\u591a\u4f8b\u5b50\uff1a     <\/p>\n
<\/a><\/p>\n\n\n\n
\n
\/* foreach example 1: value only *\/

$a = array (1, 2, 3, 17);

foreach ($a as $v) {
   print "Current value of $a: $v.n";
}

\/* foreach example 2: value (with key printed for illustration) *\/

$a = array (1, 2, 3, 17);

$i = 0; \/* for illustrative purposes only *\/

foreach($a as $v) {
    print "$a[$i] => $v.n";
    $i++;
}

\/* foreach example 3: key and value *\/

$a = array (
    "one" => 1,
    "two" => 2,
    "three" => 3,
    "seventeen" => 17
);

foreach($a as $k => $v) {
    print "$a[$k] => $v.n";
}

\/* foreach example 4: multi-dimensional arrays *\/

$a[0][0] = "a";
$a[0][1] = "b";
$a[1][0] = "y";
$a[1][1] = "z";

foreach($a as $v1) {
    foreach ($v1 as $v2) {
        print "$v2n";
    }
}

\/* foreach example 5: dynamic arrays *\/

foreach(array(1, 2, 3, 4, 5) as $v) {
    print "$vn";
}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u5167\u5bb9\u4f86\u6e90\uff1aLINK     (\u6b64\u7bc7\u6587\u7ae0\u50c5\u4f9b\u7ad9\u9577\u5099\u4efd\u53c3\u8003\u7528\uff0c\u56fa\u70ba\u52a0\u5bc6\u6587\u7ae0…<\/span><\/p>\n
Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-130","post","type-post","status-publish","format-standard","hentry","category-5"],"_links":{"self":[{"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=\/wp\/v2\/posts\/130","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=130"}],"version-history":[{"count":0,"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=\/wp\/v2\/posts\/130\/revisions"}],"wp:attachment":[{"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/learn-house.idv.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}