{"id":2997,"date":"2025-03-19T21:48:50","date_gmt":"2025-03-19T13:48:50","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2997"},"modified":"2025-03-19T21:48:50","modified_gmt":"2025-03-19T13:48:50","slug":"php-%e5%87%bd%e6%95%b0%e5%85%a8%e9%9d%a2%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/19\/php-%e5%87%bd%e6%95%b0%e5%85%a8%e9%9d%a2%e8%a7%a3%e6%9e%90\/","title":{"rendered":"PHP \u51fd\u6570\u5168\u9762\u89e3\u6790"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. \u4ec0\u4e48\u662f PHP \u51fd\u6570\uff1f<\/h2>\n\n\n\n<p>PHP <strong>\u51fd\u6570\uff08Function\uff09<\/strong> \u662f <strong>\u4e00\u7ec4\u53ef\u91cd\u590d\u6267\u884c\u7684\u4ee3\u7801\u5757<\/strong>\uff0c\u7528\u4e8e\u63d0\u9ad8\u4ee3\u7801\u7684 <strong>\u590d\u7528\u6027<\/strong> \u548c <strong>\u6a21\u5757\u5316<\/strong>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>PHP \u51fd\u6570\u5206\u7c7b<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5185\u7f6e\u51fd\u6570\uff08Built-in Functions\uff09<\/strong> \u279d \u4f8b\u5982 <code>strlen()<\/code>, <code>array_push()<\/code>, <code>date()<\/code><\/li>\n\n\n\n<li><strong>\u7528\u6237\u81ea\u5b9a\u4e49\u51fd\u6570\uff08User-defined Functions\uff09<\/strong> \u279d \u7531\u5f00\u53d1\u8005\u5b9a\u4e49\u7684\u51fd\u6570<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. <strong>PHP \u81ea\u5b9a\u4e49\u51fd\u6570<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u51fd\u6570\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>function \u51fd\u6570\u540d($\u53c2\u65701, $\u53c2\u65702, ...) {\n    \/\/ \u51fd\u6570\u4f53\n    return \u7ed3\u679c;  \/\/ \u53ef\u9009\n}<\/code><\/pre>\n\n\n\n<p>\u2705 <strong>\u6ce8\u610f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51fd\u6570\u540d<\/strong> \u5fc5\u987b\u4ee5 <strong>\u5b57\u6bcd\u6216\u4e0b\u5212\u7ebf\u5f00\u5934<\/strong>\uff08\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934\uff09<\/li>\n\n\n\n<li><strong>\u51fd\u6570\u540d\u4e0d\u533a\u5206\u5927\u5c0f\u5199<\/strong><\/li>\n\n\n\n<li><strong>\u53c2\u6570<\/strong> \u53ef\u9009<\/li>\n\n\n\n<li><strong><code>return<\/code> \u8bed\u53e5<\/strong> \u7528\u4e8e\u8fd4\u56de\u503c\uff08\u53ef\u9009\uff09<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b 1\uff1a\u65e0\u53c2\u6570\u3001\u65e0\u8fd4\u56de\u503c<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction sayHello() {\n    echo \"Hello, PHP!&lt;br&gt;\";\n}\nsayHello();\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hello, PHP!<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b 2\uff1a\u5e26\u53c2\u6570\u7684\u51fd\u6570<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction greet($name) {\n    echo \"Hello, \" . $name . \"!&lt;br&gt;\";\n}\ngreet(\"Alice\");\ngreet(\"Bob\");\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hello, Alice!\nHello, Bob!<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b 3\uff1a\u6709\u8fd4\u56de\u503c\u7684\u51fd\u6570<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction add($a, $b) {\n    return $a + $b;\n}\n$result = add(5, 10);\necho \"5 + 10 = \" . $result;\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5 + 10 = 15<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b 4\uff1a\u9ed8\u8ba4\u53c2\u6570<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction greet($name = \"Guest\") {\n    echo \"Welcome, \" . $name . \"!&lt;br&gt;\";\n}\ngreet();         \/\/ \u4f7f\u7528\u9ed8\u8ba4\u503c \"Guest\"\ngreet(\"Alice\");  \/\/ \u4f20\u5165\u53c2\u6570\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Welcome, Guest!\nWelcome, Alice!<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. <strong>\u51fd\u6570\u53c2\u6570\u8be6\u89e3<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong> 1. \u4f20\u503c\u53c2\u6570\uff08\u9ed8\u8ba4\uff09<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f20\u9012\u53d8\u91cf\u7684 <strong>\u526f\u672c<\/strong>\uff0c\u51fd\u6570\u5185\u90e8\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u539f\u53d8\u91cf<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction increment($num) {\n    $num++;\n    echo \"\u51fd\u6570\u5185\u90e8\uff1a$num &lt;br&gt;\";\n}\n$value = 5;\nincrement($value);\necho \"\u51fd\u6570\u5916\u90e8\uff1a$value &lt;br&gt;\";\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u51fd\u6570\u5185\u90e8\uff1a6\n\u51fd\u6570\u5916\u90e8\uff1a5<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong> 2. \u4f20\u5f15\u7528\u53c2\u6570\uff08&amp;\uff09<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f20\u9012 <strong>\u53d8\u91cf\u672c\u8eab<\/strong>\uff0c\u51fd\u6570\u5185\u90e8\u4fee\u6539\u4f1a\u5f71\u54cd\u539f\u53d8\u91cf<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction incrementRef(&amp;$num) {\n    $num++;\n}\n$value = 5;\nincrementRef($value);\necho \"\u6700\u7ec8\u503c\uff1a$value\"; \n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6700\u7ec8\u503c\uff1a6<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. <strong>\u53ef\u53d8\u53c2\u6570\uff08\u53ef\u4f20\u5165\u4e0d\u786e\u5b9a\u4e2a\u6570\u7684\u53c2\u6570\uff09<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong> 1. <code>func_get_args()<\/code>\uff08PHP 5 \u53ca\u4e4b\u524d\uff09<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction sumAll() {\n    $args = func_get_args();\n    return array_sum($args);\n}\necho sumAll(1, 2, 3, 4, 5);\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>15<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong> 2. <code>...$args<\/code>\uff08PHP 5.6+\uff09<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction sumAll(...$numbers) {\n    return array_sum($numbers);\n}\necho sumAll(1, 2, 3, 4, 5);\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>15<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. <strong>\u533f\u540d\u51fd\u6570\uff08Lambda\/Closure\uff09<\/strong><\/h2>\n\n\n\n<p>PHP <strong>\u533f\u540d\u51fd\u6570<\/strong>\uff08\u53c8\u79f0 <strong>\u95ed\u5305 Closure<\/strong>\uff09\uff0c\u5373 <strong>\u6ca1\u6709\u540d\u79f0\u7684\u51fd\u6570<\/strong>\uff0c\u5e38\u7528\u4e8e\u56de\u8c03\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$greet = function($name) {\n    return \"Hello, $name!\";\n};\necho $greet(\"Alice\");\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hello, Alice!<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. <strong>\u7bad\u5934\u51fd\u6570\uff08PHP 7.4+\uff09<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8bed\u6cd5\u66f4\u7b80\u6d01\uff0c<strong>\u81ea\u52a8\u7ee7\u627f\u5916\u90e8\u53d8\u91cf<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$add = fn($x, $y) =&gt; $x + $y;\necho $add(5, 10);\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>15<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. <strong>\u9012\u5f52\u51fd\u6570\uff08\u51fd\u6570\u8c03\u7528\u81ea\u8eab\uff09<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong> \u8ba1\u7b97\u9636\u4e58<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction factorial($n) {\n    if ($n == 1) {\n        return 1;\n    }\n    return $n * factorial($n - 1);\n}\necho \"5 \u7684\u9636\u4e58\uff1a\" . factorial(5);\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5 \u7684\u9636\u4e58\uff1a120<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">8. <strong>\u51fd\u6570\u7684\u4f5c\u7528\u57df<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u4f5c\u7528\u57df<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td><strong>\u5168\u5c40\u4f5c\u7528\u57df<\/strong><\/td><td>\u5b9a\u4e49\u5728\u51fd\u6570\u5916\u90e8\uff0c\u5168\u5c40\u53ef\u7528<\/td><\/tr><tr><td><strong>\u5c40\u90e8\u4f5c\u7528\u57df<\/strong><\/td><td>\u5b9a\u4e49\u5728\u51fd\u6570\u5185\u90e8\uff0c\u4ec5\u51fd\u6570\u5185\u53ef\u7528<\/td><\/tr><tr><td><strong><code>global<\/code> \u5173\u952e\u5b57<\/strong><\/td><td>\u8ba9\u51fd\u6570\u5185\u90e8\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf<\/td><\/tr><tr><td><strong><code>$GLOBALS<\/code> \u6570\u7ec4<\/strong><\/td><td>\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\u7684\u6570\u7ec4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u793a\u4f8b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$x = 10;  \/\/ \u5168\u5c40\u53d8\u91cf\nfunction test() {\n    global $x;\n    echo \"\u51fd\u6570\u5185\u90e8\uff1a$x\";\n}\ntest();\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u51fd\u6570\u5185\u90e8\uff1a10<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">9. <strong>\u51fd\u6570\u6700\u4f73\u5b9e\u8df5<\/strong><\/h2>\n\n\n\n<p>\u2705 <strong>\u51fd\u6570\u540d\u5e94\u6709\u610f\u4e49<\/strong>\uff08<code>calculateTax()<\/code> \u2705\uff0c<code>func1()<\/code> \u274c\uff09<br>\u2705 <strong>\u5c3d\u91cf\u4f7f\u7528 <code>return<\/code> \u4ee3\u66ff <code>echo<\/code><\/strong>\uff08\u63d0\u9ad8\u590d\u7528\u6027\uff09<br>\u2705 <strong>\u907f\u514d\u8fc7\u957f\u51fd\u6570<\/strong>\uff08\u5355\u4e00\u804c\u8d23\u539f\u5219\uff09<br>\u2705 <strong>\u4f7f\u7528 <code>...$args<\/code> \u5904\u7406\u4e0d\u786e\u5b9a\u53c2\u6570<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">10. <strong>\u7ec3\u4e60\u9898<\/strong><\/h2>\n\n\n\n<p>1\ufe0f\u20e3 <strong>\u7f16\u5199\u4e00\u4e2a <code>isEven($num)<\/code> \u51fd\u6570\uff0c\u8fd4\u56de <code>true<\/code> \u6216 <code>false<\/code><\/strong><br>2\ufe0f\u20e3 <strong>\u7f16\u5199\u4e00\u4e2a <code>findMax($arr)<\/code> \u51fd\u6570\uff0c\u8fd4\u56de\u6570\u7ec4\u7684\u6700\u5927\u503c<\/strong><br>3\ufe0f\u20e3 <strong>\u7f16\u5199\u4e00\u4e2a\u9012\u5f52\u51fd\u6570 <code>sumToN($n)<\/code>\uff0c\u8ba1\u7b97 <code>1 + 2 + ... + n<\/code><\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd17 \u76f8\u5173\u53c2\u8003\u8d44\u6599<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.php.net\/manual\/en\/functions.php\">PHP \u5b98\u65b9\u6587\u6863 &#8211; \u51fd\u6570<\/a><\/li>\n<\/ul>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u4ec0\u4e48\u662f PHP \u51fd\u6570\uff1f PHP \u51fd\u6570\uff08Function\uff09 \u662f \u4e00\u7ec4\u53ef\u91cd\u590d\u6267\u884c\u7684\u4ee3\u7801\u5757\uff0c\u7528\u4e8e\u63d0\u9ad8\u4ee3\u7801\u7684 \u590d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2998,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[80],"tags":[],"class_list":["post-2997","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2997","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2997"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2997\/revisions"}],"predecessor-version":[{"id":2999,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2997\/revisions\/2999"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/2998"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2997"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}