PHP常用100个函数总结（未完成）
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Top100函数统计结果引用 learnku官方统计 100 个最常用的 PHP 函数
| 排行 | 函数 | 注释 |
|---|---|---|
| 1 | count | 计算数组中的单元数目或对象中的属性个数 |
| 2 | is_array | |
| 3 | substr | |
| 4 | in_array | |
| 5 | explode | |
| 6 | str_replace | |
| 7 | implode | |
| 8 | strlen | |
| 9 | array_merge | |
| 10 | strpos | |
| 11 | preg_match | |
| 12 | sprintf | |
| 13 | trim | |
| 14 | strtolower | |
| 15 | file_exists | |
| 16 | is_string | |
| 17 | preg_replace | |
| 18 | file_get_contents | |
| 19 | array_key_exists | |
| 20 | array_keys | |
| 21 | dirname | |
| 22 | function_exists | |
| 23 | array_map | |
| 24 | get_class | |
| 25 | class_exists | |
| 26 | is_object | |
| 27 | time | |
| 28 | json_encode | |
| 29 | date | |
| 30 | is_null | |
| 31 | is_numeric | |
| 32 | array_shift | |
| 33 | defined | |
| 34 | is_dir | |
| 35 | json_decode | |
| 36 | header | |
| 37 | strtoupper | |
| 38 | array_values | |
| 39 | md5 | |
| 40 | method_exists | |
| 41 | file_put_contents | |
| 42 | rtrim | |
| 43 | array_pop | |
| 44 | unlink | |
| 45 | basename | |
| 46 | realpath | |
| 47 | call_user_func | |
| 48 | call_user_func_array | |
| 49 | fopen | |
| 50 | microtime | |
| 51 | fclose | |
| 52 | is_int | |
| 53 | is_file | |
| 54 | array_slice | |
| 55 | preg_match_all | |
| 56 | ucfirst | |
| 57 | intval | |
| 58 | str_repeat | |
| 59 | serialize | |
| 60 | array_filter | |
| 61 | mkdir | |
| 62 | is_callable | |
| 63 | ltrim | |
| 64 | ob_start | |
| 65 | round | |
| 66 | fwrite | |
| 67 | array_unique | |
| 68 | array_search | |
| 69 | reset | |
| 70 | array_unshift | |
| 71 | parse_url | |
| 72 | func_get_args | |
| 73 | end | |
| 74 | base64_encode | |
| 75 | unserialize | |
| 76 | max | |
| 77 | preg_split | |
| 78 | gettype | |
| 79 | strrpos | |
| 80 | version_compare | |
| 81 | array_push | |
| 82 | floor | |
| 83 | strtotime | |
| 84 | htmlspecialchars | |
| 85 | ini_get | |
| 86 | ini_set | |
| 87 | chr | |
| 88 | extension_loaded | |
| 89 | is_bool | |
| 90 | ksort | |
| 91 | array_reverse | |
| 92 | ord | |
| 93 | uniqid | |
| 94 | strtr | |
| 95 | array_diff | |
| 96 | error_reporting | |
| 97 | ceil | |
| 98 | urlencode | |
| 99 | min | |
| 100 | print_r |
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