{"id":102,"date":"2023-06-27T10:13:05","date_gmt":"2023-06-27T02:13:05","guid":{"rendered":"http:\/\/a.yeliuliu.com\/?p=102"},"modified":"2025-10-21T17:21:21","modified_gmt":"2025-10-21T09:21:21","slug":"php%e4%b8%adforeach%e7%9a%84%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.hyw.life\/?p=102","title":{"rendered":"PHP\u4e2dforeach\u7684\u7528\u6cd5"},"content":{"rendered":"\n

\u672c\u7bc7\u6587\u7ae0\u4ecb\u7ecd\u4e86\u8be6\u89e3PHP\u4e2dforeach\u7684\u7528\u6cd5\u548c\u5b9e\u4f8b\uff0c\u8be6\u7ec6\u4ecb\u7ecd\u4e86foreach\u7684\u7528\u6cd5\uff0c\u611f\u5174\u8da3\u7684\u5c0f\u4f19\u4f34\u4eec\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n\n\n\n

\u5728PHP\u4e2d\u7ecf\u5e38\u4f1a\u7528\u5230foreach\u7684\u4f7f\u7528\uff0c\u800c\u8981\u7528\u5230foreach\uff0c\u5c31\u5fc5\u987b\u7528\u5230\u6570\u7ec4\u3002\u56e0\u6b64\uff0c\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u4e00\u8fb9\u8bb2\u6570\u7ec4\uff0c\u4e00\u8fb9\u8bb2foreach\u3002<\/p>\n\n\n\n<\/span>

foreach\u6709\u4e24\u79cd\u8bed\u6cd5\uff1a<\/strong><\/h2>\n\n\n\n<\/span>

\u7b2c\u4e00\u79cd\uff1a<\/h3>\n\n\n\n

\u904d\u5386\u7ed9\u5b9a\u7684 \u6570\u7ec4\u8bed\u53e5 array_expression \u6570\u7ec4\u3002\u6bcf\u6b21\u5faa\u73af\u4e2d\uff0c\u5f53\u524d\u5355\u5143\u7684\u503c\u88ab\u8d4b\u7ed9 $value \u5e76\u4e14\u6570\u7ec4\u5185\u90e8\u7684\u6307\u9488\u5411\u524d\u79fb\u4e00\u6b65\uff08\u56e0\u6b64\u4e0b\u4e00\u6b21\u5faa\u73af\u4e2d\u5c06\u4f1a\u5f97\u5230\u4e0b\u4e00\u4e2a\u5355\u5143\uff09\u3002<\/p>\n\n\n\n

\nforeach (array_expression as $value)\n\n<\/code><\/pre>\n\n\n\n<\/span>
\u7b2c\u4e8c\u79cd\uff1a<\/h3>\n\n\n\n
\u540c\u4e0a\uff0c\u540c\u65f6\u5f53\u524d\u5355\u5143\u7684\u952e\u540d\u4e5f\u4f1a\u5728\u6bcf\u6b21\u5faa\u73af\u4e2d\u88ab\u8d4b\u7ed9\u53d8\u91cf $key\u3002<\/p>\n\n\n\n
\nforeach (array_expression as $key => $value)\n\n<\/code><\/pre>\n\n\n\n
\u4e0b\u8fb9\u6211\u4eec\u4e00\u4e00\u6765\u8bb2\u89e3\u4e00\u4e0b\uff01<\/p>\n\n\n\n<\/span>
\u4e00\u3001\u4e00\u7ef4\u666e\u901a\u6570\u7ec4 \u4e0e foreach<\/strong><\/h2>\n\n\n\n
\u6211\u4eec\u5148\u5199\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n$a = array('Tom','Mary','Peter','Jack');\n\n<\/code><\/pre>\n\n\n\n
1\u3001\u6211\u4eec\u7528\u7b2c\u4e00\u79cdforeach\u65b9\u6cd5\u6765\u8f93\u51fa\u3002<\/p>\n\n\n\n
\nforeach ($a as $value) {\n  echo $value.\"\";\n}\n\n<\/code><\/pre>\n\n\n\n
\u6700\u540e\u5f97\u5230\u7684\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
Tom
Mary
Peter
Jack<\/p>\n\n\n\n
2\u3001\u6211\u4eec\u7528\u7b2c\u4e8c\u79cd foreach \u65b9\u6cd5\u6765\u8f93\u51fa\u3002<\/p>\n\n\n\n
\nforeach ($a as $key => $value) {\n  echo $key.','.$value.'';\n}\n\n<\/code><\/pre>\n\n\n\n
\u6700\u540e\u5f97\u5230\u7684\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
0,Tom
1,Mary
2,Peter
3,Jack<\/p>\n\n\n\n
\u603b\u7ed3\uff1a \u5f88\u660e\u663e\uff0c\u6211\u4eec\u770b\u5230\u53ea\u662f\u591a\u4e86\u4e00\u4e2a $key \uff0c \u800c\u8fd9\u4e2a $key \u7684\u503c\u5c31\u662f\u5e8f\u53f7 1\u30012\u30013\u30014 \u7b49\u7b49\uff01<\/p>\n\n\n\n<\/span>
\u4e8c\u3001\u4e00\u7ef4\u5173\u8054\u6570\u7ec4 \u4e0e foreach<\/strong><\/h2>\n\n\n\n
\u4e00\u7ef4\u5173\u8054\u6570\u7ec4\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n$b = array('a'=>'Tom','b'=>'Mary','c'=>'Peter','d'=>'Jack');\n\n<\/code><\/pre>\n\n\n\n
\u4e5f\u6709\u4eba\u7231\u8fd9\u4e48\u5199\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n$b = array(\n  'a'=>'Tom',\n  'b'=>'Mary',\n  'c'=>'Peter',\n  'd'=>'Jack'\n);\n\n<\/code><\/pre>\n\n\n\n
1\u3001\u6211\u4eec\u7528\u7b2c\u4e00\u79cdforeach\u65b9\u6cd5\u6765\u8f93\u51fa\u548c\u4e0a\u8fb9\u4e00\u6837\u3002<\/p>\n\n\n\n
\nforeach ($b as $value) {\n  echo $value.'';\n}\n\n<\/code><\/pre>\n\n\n\n
\u6700\u540e\u5f97\u5230\u7684\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
Tom
Mary
Peter
Jack<\/p>\n\n\n\n
2\u3001\u6211\u4eec\u7528\u7b2c\u4e8c\u79cdforeach\u65b9\u6cd5\u6765\u8f93\u51fa\u3002<\/p>\n\n\n\n
\nforeach ($b as $key => $value) {\n  echo $key.','.$value.'';\n}\n\n<\/code><\/pre>\n\n\n\n
\u6700\u540e\u5f97\u5230\u7684\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
a,Tom
b,Mary
c,Peter
d,Jack<\/p>\n\n\n\n
\u603b\u7ed3\uff1a \u5f88\u660e\u663e\uff0c\u5728\u4e00\u7ef4\u5173\u8054\u6570\u7ec4\u4e0b\uff0c $key\u5c31\u662f\u5173\u8054\u7684\u5e8f\u53f7\uff0c\u5373\u76f8\u5e94\u7684a\u3001b\u3001c\u3001d\u3002<\/p>\n\n\n\n<\/span>
\u4e09\u3001\u4e8c\u7ef4\u666e\u901a\u6570\u7ec4 \u4e0e foreach<\/strong><\/h2>\n\n\n\n
\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u65f6\uff0c\u7a0d\u5fae\u9ebb\u70e6\u4e00\u4e9b\uff0c\u4e3a\u4ec0\u4e48\u5462\uff1f\u56e0\u4e3a\u904d\u5386\u51fa\u6765\u7684value\u503c\uff0c\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u65e2\u7136\u662f\u6570\u7ec4\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u5bf9\u6570\u7ec4\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\uff01<\/p>\n\n\n\n
\u6211\u4eec\u5148\u770b\u4e00\u4e2a\u57fa\u672c\u7684\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n$c = array(\n  array('1','Tom'),\n  array('2','Mary'),\n  array('3','Peter'),\n  array('4','Jack')\n);\n\n<\/code><\/pre>\n\n\n\n
1\u3001\u6211\u4eec\u91c7\u7528\u7b2c\u4e00\u79cd foreach\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\nforeach ($c as $value) {\n  print_r($value);\n  echo \"\";\n}\n\n<\/code><\/pre>\n\n\n\n
\u5f97\u5230\u8fd9\u6837\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n
Array ( [0] => 11 [1] => Tom )
Array ( [0] => 22 [1] => Mary )
Array ( [0] => 33 [1] => Peter )
Array ( [0] => 44 [1] => Jack )<\/p>\n\n\n\n
2\u3001\u6211\u4eec\u91c7\u7528\u7b2c\u4e8c\u79cdforeach\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\nforeach ($c as $key => $value) {\n  echo '$key='.$key.'';\n  print_r($value);\n  echo '';\n}\n\n<\/code><\/pre>\n\n\n\n
\u5f97\u5230\u5982\u4e0b\u7684\u7ed3\u679c:<\/p>\n\n\n\n
$key=0
Array ( [0] => 11 [1] => Tom )
$key=1
Array ( [0] => 22 [1] => Mary )
$key=2
Array ( [0] => 33 [1] => Peter )
$key=3
Array ( [0] => 44 [1] => Jack )<\/p>\n\n\n\n
\u603b\u7ed3\uff1a\u7531\u4e0a\u53ef\u77e5\uff0c\u57fa\u672c\u4e8c\u7ef4\u6570\u7ec4\uff0c$key\u5c31\u662f\u5e8f\u53f7 ,\u5982 0\\1\\2\\3 \u7b49\u7b49\uff01<\/p>\n\n\n\n<\/span>
\u56db\u3001\u5173\u8054\u4e8c\u7ef4\u6570\u7ec4 \u4e0e foreach<\/strong><\/h2>\n\n\n\n
\u8bf4\u660e\uff0c\u5173\u8054\u4e8c\u7ef4\u6570\u7ec4\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u7528\u5230\u7684\u53ef\u591a\u4e86\u3002\u4e3a\u4ec0\u4e48\uff1f\u4e00\u822c\u6570\u636e\u5e93\u63d0\u53d6\u51fa\u6765\u7684\u6570\u636e\u90fd\u662f\u5173\u8054\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5b66\u4f1a\u4e86\u5173\u8054\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5c31\u5728PHP\u7684\u5b9e\u6218\u4e2d\uff0c\u5df2\u7ecf\u638c\u63e1\u4e86\u5f88\u5927\u4e00\u90e8\u5206\u4e86\uff01<\/p>\n\n\n\n
\u90a3\u4e48\u5148\u5217\u51fa\u5173\u8054\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n$d = array(\n    array('id'=>'11','name'=>'Tom'),\n    array('id'=>'22','name'=>'Mary'),\n    array('id'=>'33','name'=>'Peter'),\n    array('id'=>'44','name'=>'Jack')\n);\n\n<\/code><\/pre>\n\n\n\n
1\u3001\u7528\u7b2c\u4e00\u79cd\u65b9\u6cd5\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\nforeach ($d as $value) {\n  print_r($value);\n  echo '';\n}\n\n<\/code><\/pre>\n\n\n\n
\u5f97\u5230\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
Array ( [id] => 11 [name] => Tom )
Array ( [id] => 22 [name] => Mary )
Array ( [id] => 33 [name] => Peter )
Array ( [id] => 44 [name] => Jack )<\/p>\n\n\n\n
\u5f88\u660e\u663e\uff0c\u5173\u8054\u4e0e\u4e0d\u5173\u8054\u7684\u533a\u522b\u5c31\u662f\uff1a\u4e0d\u5173\u8054\u524d\u8fb9\u662f 0\/1 \u7b49\u7b49\uff0c\u800c\u5173\u8054\u663e\u793a\u5177\u4f53\u540d\u79f0 id\/name \u7b49\u7b49\u3002<\/p>\n\n\n\n
2\u3001\u7528\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\nforeach ($d as $key => $value) {\n  echo '$key='.$key.'';\n  print_r($value);\n  echo '';\n}\n\n<\/code><\/pre>\n\n\n\n
\u5f97\u5230\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
$key=0
Array ( [id] => 11 [name] => Tom )
$key=1
Array ( [id] => 22 [name] => Mary )
$key=2
Array ( [id] => 33 [name] => Peter )
$key=3
Array ( [id] => 44 [name] => Jack )<\/p>\n\n\n\n
\u603b\u7ed3\uff1a\u8fd9\u91cc$key\u4ecd\u7136\u662f 0\/1\/2\/3 \u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u672c\u7bc7\u6587\u7ae0\u4ecb\u7ecd\u4e86\u8be6\u89e3PHP\u4e2dforeach\u7684\u7528\u6cd5\u548c\u5b9e\u4f8b\uff0c\u8be6\u7ec6\u4ecb\u7ecd\u4e86foreach\u7684\u7528\u6cd5\uff0c\u611f\u5174\u8da3\u7684\u5c0f\u4f19\u4f34\u4eec\u53ef\u4ee5\u53c2\u8003 […]<\/p>\n","protected":false},"author":1,"featured_media":489,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-102","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hd"],"_links":{"self":[{"href":"https:\/\/www.hyw.life\/index.php?rest_route=\/wp\/v2\/posts\/102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hyw.life\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hyw.life\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hyw.life\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hyw.life\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=102"}],"version-history":[{"count":16,"href":"https:\/\/www.hyw.life\/index.php?rest_route=\/wp\/v2\/posts\/102\/revisions"}],"predecessor-version":[{"id":139,"href":"https:\/\/www.hyw.life\/index.php?rest_route=\/wp\/v2\/posts\/102\/revisions\/139"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hyw.life\/index.php?rest_route=\/wp\/v2\/media\/489"}],"wp:attachment":[{"href":"https:\/\/www.hyw.life\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hyw.life\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hyw.life\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}