{"id":2791,"date":"2022-10-18T23:56:37","date_gmt":"2022-10-18T14:56:37","guid":{"rendered":"https:\/\/took.jp\/?p=2791"},"modified":"2022-10-18T23:56:37","modified_gmt":"2022-10-18T14:56:37","slug":"php-cheat-sheet","status":"publish","type":"post","link":"https:\/\/took.jp\/tech-blog\/php-cheat-sheet\/","title":{"rendered":"\u3010PHP\u3011\u63a8\u5968\u3057\u305f\u3044\u8a18\u8ff0\u65b9\u6cd5 \u30c1\u30fc\u30c8\u30b7\u30fc\u30c8"},"content":{"rendered":"

PHP\u63a8\u5968\u3057\u305f\u3044\u8a18\u8ff0\u65b9\u6cd5\u306e\u30c1\u30fc\u30c8\u30b7\u30fc\u30c8<\/h2>\n

\u901f\u5ea6\u9762\u3060\u3051\u3067\u306a\u304f\u3001\u53ef\u8aad\u6027\u3082\u8003\u616e\u3057\u3066\u3001\u79c1\u304c\u666e\u6bb5\u304b\u3089\u6c17\u3092\u3064\u3051\u3066\u3044\u308b\u8a18\u8ff0\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n

\u53c2\u8003\u306b\u3069\u3046\u305e\u3002<\/p>\n

 <\/p>\n

array_key_exists\u306f\u4f7f\u7528\u3057\u306a\u3044<\/h3>\n

array_key_exists\u306fPHP7.4.x\u4ee5\u964d\u306b\u975e\u63a8\u5968\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002(\u53c2\u8003URL: https:\/\/www.php.net\/manual\/ja\/migration74.deprecated.php<\/a>)<\/p>\n

\u307e\u305f\u3001isset\u306f\u8a00\u8a9e\u69cb\u9020\u3067\u3042\u308b\u305f\u3081\u3001arra_key_exists\u3088\u308a\u3082\u9ad8\u901f\u306b\u52d5\u4f5c\u3057\u307e\u3059\u3002<\/p>\n

$array = ['key1' => 'value1', 'key2' => 'value2'];\r\n$isExistKey = array_key_exists('key1', $array);<\/code><\/pre>\n
 <\/p>\n
\u4ee3\u308f\u308a\u306bisset\u3092\u4f7f\u7528\u3059\u308b\u3002<\/p>\n
$array = ['key1' => 'value1', 'key2' => 'value2'];\r\n$isExistKey = isset($array['key1']);<\/code><\/pre>\n
\u203b isset\u306e\u5834\u5408\u306f\u3001\u5024\u306bnull\u304c\u5165\u3063\u3066\u3044\u308b\u6642\u306b\u3001\u30ad\u30fc\u304c\u5b58\u5728\u3057\u3066\u3082\u3001false\u3092\u8fd4\u3059\u305f\u3081\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/span><\/p>\n
 <\/p>\n
\u4e09\u9805\u6f14\u7b97\u5b50\u3001\u30a8\u30eb\u30d3\u30b9\u6f14\u7b97\u5b50\u7b49\u3092\u6d3b\u7528\u3059\u308b<\/h3>\n
\u3053\u308c\u3089\u306e\u6f14\u7b97\u5b50\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u8a18\u8ff0\u3067\u304d\u3001\u4f7f\u7528\u7b87\u6240\u306b\u3088\u3063\u3066\u306f\u3001\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u304c\u3001\u30cd\u30b9\u30c8\u3059\u308b\u5834\u5408\u7b49\u3001\u8907\u96d1\u306b\u306a\u308b\u5834\u5408\u306e\u4f7f\u7528\u306f\u304a\u3059\u3059\u3081\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
 <\/p>\n
\u4e09\u9805\u6f14\u7b97\u5b50<\/h4>\n
\u901a\u5e38\u306e\u8a18\u8ff0<\/p>\n
if($number % 2 === 0){\r\n    echo '\u5076\u6570';\r\n}else{\r\n    echo '\u5947\u6570';\r\n}<\/code><\/pre>\n
 <\/p>\n
\u4e09\u9805\u6f14\u7b97\u5b50<\/p>\n
echo $number %2 == 0 ? '\u5076\u6570' : '\u5947\u6570';<\/code><\/pre>\n
 <\/p>\n
\u30a8\u30eb\u30d3\u30b9\u6f14\u7b97\u5b50<\/h4>\n
\u901a\u5e38\u306e\u8a18\u8ff0<\/p>\n
if(!empty($sideburns)){\r\n    echo 'Presley';\r\n}<\/code><\/pre>\n
 <\/p>\n
\u30a8\u30eb\u30d3\u30b9\u6f14\u7b97\u5b50<\/p>\n
empty($sideburns) ?: echo 'Presley';<\/code><\/pre>\n
\u203b \u30a8\u30eb\u30d3\u30b9\u6f14\u7b97\u5b50\u306e\u540d\u524d\u306e\u7531\u6765\u306f\u3001\u672c\u5f53\u306b\u30d7\u30ec\u30b9\u30ea\u30fc\u3089\u3057\u3044\u3067\u3059...\u3002\uff08\u53c2\u8003URL: https:\/\/qiita.com\/ito_gen\/items\/7650454fbb27baefc1f7<\/a>\uff09<\/span><\/p>\n
 <\/p>\n
null\u5408\u4f53\u6f14\u7b97\u5b50<\/h4>\n
\u901a\u5e38\u306e\u8a18\u8ff0<\/p>\n
if(is_null($val)){\r\n    echo '\u5024\u304cnull\u3067\u3059';\r\n}<\/code><\/pre>\n
 <\/p>\n
null\u6f14\u7b97\u5b50<\/p>\n
echo $val ?? '\u5024\u304cnull\u3067\u3059';<\/code><\/pre>\n
\u203b PHP7\u304b\u3089\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n
 <\/p>\n
\u5b87\u5b99\u8239\u6f14\u7b97\u5b50<\/h4>\n
\u901a\u5e38\u306e\u8a18\u8ff0<\/p>\n
if($a > $b){\r\n    return 1;\r\n}elseif($a == $b){\r\n    return 0;\r\n}elseif($a < $b){\r\n    return -1;\r\n}<\/code><\/pre>\n
 <\/p>\n
\u5b87\u5b99\u8239\u6f14\u7b97\u5b50<\/p>\n
return $a <=> $b;<\/code><\/pre>\n
 <\/p>\n
\u5b87\u5b99\u8239\u6f14\u7b97\u5b50\u3067\u306f\u3001<\/p>\n
\u5de6\u8fba\u304c\u5927\u304d\u3044\u5834\u5408\u306b\u30011<\/p>\n
\u540c\u5024\u306e\u5834\u5408\u306b\u30010<\/p>\n
\u53f3\u8fba\u304c\u5927\u304d\u3044\u5834\u5408\u306b\u3001-1<\/p>\n
\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
echo 1 <=> 1; \/\/ 0\r\necho 1 <=> 2; \/\/ -1\r\necho 2 <=> 1; \/\/ 1<\/code><\/pre>\n
\u203b PHP7\u304b\u3089\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u578b\u306e\u6bd4\u8f03\u306f\u884c\u308f\u308c\u307e\u305b\u3093\u3002<\/span><\/p>\n
 <\/p>\n
null\u30bb\u30fc\u30d5\u6f14\u7b97\u5b50<\/h4>\n
\u901a\u5e38\u306e\u8a18\u8ff0<\/p>\n
$user = new User();\r\n$age = 0;\r\nif(!empty($user){\r\n    $age = $user->getAge();\r\n}<\/code><\/pre>\n
 <\/p>\n
null\u30bb\u30fc\u30d5\u6f14\u7b97\u5b50<\/p>\n
$user = new User();\r\n$age = $user?->getAge() ?? 0;<\/code><\/pre>\n
 <\/p>\n
PHP8\u4ee5\u524d\u307e\u3067\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u7a7a\uff08$user\u304cnull\uff09\u3067\u3042\u3063\u305f\u5834\u5408\u306b\u306f\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001null\u30bb\u30fc\u30d5\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u6570\u30a2\u30af\u30bb\u30b9\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u306f\u3001null\u304c\u8fd4\u308b\u3088\u3046\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u203b PHP8\u304b\u3089\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u30d7\u30ed\u30d1\u30c6\u30a3\u30a2\u30af\u30bb\u30b9\u3067\u3042\u308c\u3070\u3001PHP8\u4ee5\u524d\u3067\u3082null\u5b89\u5168\u3067\u3059\u3002<\/span><\/p>\n
 <\/p>\n
 <\/p>\n
\u914d\u5217\u304b\u3089\u30e9\u30f3\u30c0\u30e0\u306b\u53d6\u308a\u51fa\u3059\u6642\u306b\u306f\u3001shalfull\u3092\u4f7f\u7528\u3057\u306a\u3044<\/h3>\n
\u826f\u304f\u306a\u3044\u4f8b<\/h4>\n
\u30b7\u30f3\u30d7\u30eb\u306b\u8a18\u8ff0\u3067\u304d\u3066\u898b\u6804\u3048\u306f\u826f\u3044\u3067\u3059\u304c\u3001\u914d\u5217\u304c\u9577\u304f\u306a\u308b\u3068\u304b\u306a\u308a\u91cd\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
$fruits = ['apple', 'orange', 'grape'];\r\nshuffle($array);\r\necho $array[0];<\/code><\/pre>\n
\u203b \u901f\u5ea6\u6bd4\u8f03\u3092\u884c\u306a\u3063\u3066\u3044\u308b\u30b5\u30a4\u30c8\u304c\u3042\u308a\u307e\u3057\u305f\u3002(\u53c2\u8003URL: https:\/\/ameblo.jp\/ca-seo\/entry-10128785884.html<\/a>)<\/span><\/p>\n
 <\/p>\n
\u826f\u3044\u4f8b<\/h4>\n
\u3053\u3061\u3089\u306f\u7b2c\u4e8c\u5f15\u6570\u306e\u5927\u304d\u3055\u304c\u5897\u3048\u308b\u307b\u3069\u91cd\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
$fruits = ['apple', 'orange', 'grape']; \r\n$rand_keys = array_rand($array, 3);\r\necho $array[$rand_keys[0]];<\/code><\/pre>\n
 <\/p>\n
\u3082\u3063\u3068\u826f\u3044\u4f8b<\/h4>\n
\u4e71\u6570\u751f\u6210\u306e\u95a2\u6570\u306f\u3001mt_rand\u306e\u4ed6\u306brand\u304c\u3042\u308a\u307e\u3059\u304c\u3001mt_rand\u306e\u65b9\u304c\u6570\u500d\u65e9\u304f\u52d5\u4f5c\u3059\u308b\u3068\u8a00\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
$fruits = ['apple', 'orange', 'grape'];\r\n$rand = mt_rand(0, count($array) - 1);\r\necho $array[$rand];<\/code><\/pre>\n
 <\/p>\n
\u8ca0\u306e\u6570\u3092\u8fd4\u3057\u305f\u304f\u306a\u3044\u6642\u306f\u3001max\u3092\u6d3b\u7528\u3059\u308b<\/h3>\n
\u8aad\u307f\u306b\u304f\u3044\u8a18\u8ff0<\/p>\n
if(0 > $number){\r\n    return 0;\r\n}\r\nreturn $number<\/code><\/pre>\n
 <\/p>\n
\u8aad\u307f\u3084\u3059\u3044\u8a18\u8ff0<\/p>\n
return max(0, $number);<\/code><\/pre>\n
\u203b \u9006\u3082\u3057\u304b\u308a\u3001\u7279\u5b9a\u5024\u4ee5\u4e0a\u306f\u8fd4\u3055\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u5834\u5408\u306f\u3001min\u95a2\u6570\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/span><\/p>\n
 <\/p>\n
\u524d\u7f6e\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\uff08\u30c7\u30af\u30ea\u30e1\u30f3\u30c8\uff09\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
\u5f8c\u7f6e\u306e\u5834\u5408<\/p>\n
for($i = 0; $i < 100; $i++){}\r\n<\/code><\/pre>\n
 <\/p>\n
\u524d\u7f6e\u306e\u5834\u5408<\/p>\n
for($i = 0; $i < 100; ++$i){}<\/code><\/pre>\n
\u203b \u524d\u7f6e\u306e\u65b9\u304c\u5b9f\u884c\u901f\u5ea6\u304c\u901f\u3044\u3068\u8a00\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u3053\u307e\u3067\u5927\u5e45\u306b\u5909\u308f\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u30ec\u30d3\u30e5\u30fc\u6307\u6458\u3059\u308b\u7a0b\u3067\u306f\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u304c...\u3002<\/span><\/p>\n
 <\/p>\n
\u540c\u3058\u578b\u306e\u6bd4\u8f03\u6642\u306b\u306f==\u3067\u306f\u306a\u304f===\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
\u826f\u304f\u306a\u3044\u4f8b<\/p>\n
1 == 1<\/code><\/pre>\n
 <\/p>\n
\u826f\u3044\u4f8b<\/p>\n
1 === 1<\/code><\/pre>\n
 <\/p>\n
==\u306e\u5834\u5408\u306b\u306f\u3001\u30ad\u30e3\u30b9\u30c8\u5f8c\u306b\u6bd4\u8f03\u3055\u308c\u308b\u305f\u3081\u3001\u901f\u5ea6\u304c\u843d\u3061\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n
\u540c\u3058\u578b\u3060\u3068\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u3001===\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u5fc3\u304c\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n
 <\/p>\n
\u30d3\u30c3\u30c8\u6f14\u7b97\u5b50\u3092\u6d3b\u7528\u3059\u308b<\/h3>\n
\u901a\u5e38\u306e\u8a18\u8ff0\u65b9\u6cd5<\/p>\n
$number \/ 2; \r\n$number \/ 4; \r\n$number * 2; \r\n$number * 4; <\/code><\/pre>\n
 <\/p>\n
\u30d3\u30c3\u30c8\u6f14\u7b97\u5b50<\/p>\n
$number >> 1; \/\/ \u534a\u5206\r\n$number >> 2; \/\/ 4\u5206\u306e1\r\n$number << 1; \/\/ 2\u500d\r\n$number << 2; \/\/ 4\u500d<\/code><\/pre>\n
\u6163\u308c\u3066\u3044\u306a\u3044\u3068\u53ef\u8aad\u6027\u304c\u843d\u3061\u307e\u3059\u304c\u3001\u30d3\u30c3\u30c8\u6f14\u7b97\u5b50\u306e\u65b9\u304c\u901f\u5ea6\u304c\u901f\u3044\u3068\u8a00\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u203b \u5c0f\u6570\u70b9\u306f\u3001\u5207\u308a\u6368\u3066\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
PHP\u63a8\u5968\u3057\u305f\u3044\u8a18\u8ff0\u65b9\u6cd5\u306e\u30c1\u30fc\u30c8\u30b7\u30fc\u30c8 \u901f\u5ea6\u9762\u3060\u3051\u3067\u306a\u304f\u3001\u53ef\u8aad\u6027\u3082\u8003\u616e\u3057\u3066\u3001\u79c1\u304c\u666e\u6bb5\u304b\u3089\u6c17\u3092\u3064\u3051\u3066\u3044\u308b\u8a18\u8ff0\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002 \u53c2\u8003\u306b\u3069\u3046\u305e\u3002   array_key_exists\u306f\u4f7f\u7528\u3057\u306a\u3044 array_key_exists\u306fP\u2026<\/p>\n","protected":false},"author":3,"featured_media":2916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[67],"tags":[],"class_list":["post-2791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/posts\/2791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/comments?post=2791"}],"version-history":[{"count":0,"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/posts\/2791\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/media\/2916"}],"wp:attachment":[{"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/media?parent=2791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/categories?post=2791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/took.jp\/tech-blog\/wp-json\/wp\/v2\/tags?post=2791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}