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‎README.md

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# TopPHPFunctions
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# Top PHP Functions
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## The 100 PHP functions that you have to know (2022)
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Here is the top 100 PHP functions: it is the list of the most often used PHP native functions.
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### PHP Functions
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| Rank | Function | Frequency | Average |
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| ------ | --------- | ------------- | ------- |
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| 1 | file-exists | 62.80% | 13 |
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| 2 | str-replace | 58.20% | 33 |
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| 3 | implode | 57.31% | 35 |
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| 4 | count | 56.42% | 61 |
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| 5 | dirname | 56.38% | 13 |
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| 6 | substr | 55.84% | 53 |
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| 7 | sprintf | 55.26% | 80 |
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| 8 | strpos | 55.07% | 24 |
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| 9 | array_merge | 54.80% | 35 |
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| 10 | in_array | 51.39% | 33 |
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| 11 | explode | 51.35% | 26 |
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| 12 | strlen | 50.97% | 35 |
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| 13 | is_array | 50.73% | 46 |
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| 14 | array_key_exists | 49.54% | 28 |
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| 15 | array_keys | 49.27% | 16 |
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| 16 | preg_match | 46.52% | 28 |
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| 17 | file_get_contents | 46.48% | 8 |
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| 18 | is_file | 44.43% | 6 |
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| 19 | array_values | 42.81% | 7 |
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| 20 | file_put_contents | 42.46% | 4 |
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| 21 | trim | 41.57% | 25 |
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| 22 | method_exists | 41.49% | 8 |
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| 23 | defined | 40.87% | 19 |
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| 24 | is_string | 40.76% | 20 |
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| 25 | function_exists | 40.29% | 20 |
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| 26 | array_map | 39.33% | 12 |
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| 27 | preg_replace | 39.02% | 17 |
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| 28 | strtolower | 38.94% | 19 |
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| 29 | is_dir | 38.67% | 6 |
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| 30 | strtr | 38.01% | 5 |
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| 31 | call_user_func | 37.01% | 4 |
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| 32 | strrpos | 36.70% | 4 |
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| 33 | call_user_func_array | 36.43% | 3 |
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| 34 | array_flip | 35.89% | 2 |
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| 35 | fwrite | 35.89% | 4 |
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| 36 | rtrim | 35.69% | 6 |
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| 37 | filter_var | 35.65% | 2 |
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| 38 | ini_get | 35.15% | 5 |
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| 39 | json_decode | 34.76% | 7 |
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| 40 | array_filter | 34.76% | 7 |
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| 41 | realpath | 34.15% | 4 |
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| 42 | header | 34.07% | 7 |
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| 43 | class_exists | 34.03% | 12 |
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| 44 | json_encode | 33.49% | 9 |
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| 45 | trigger_error | 32.95% | 5 |
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| 46 | get_class | 32.95% | 13 |
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| 47 | spl_autoload_register | 32.10% | 1 |
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| 48 | unlink | 30.43% | 5 |
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| 49 | headers_sent | 29.78% | 1 |
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| 50 | is_object | 29.31% | 11 |
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| 51 | mkdir | 29.20% | 2 |
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| 52 | array_shift | 28.69% | 6 |
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| 53 | spl_autoload_unregister | 28.54% | 1 |
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| 54 | apcu_fetch | 28.23% | 0 |
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| 55 | array_pop | 28.11% | 5 |
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| 56 | stream_resolve_include_path | 27.84% | 0 |
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| 57 | is_int | 27.65% | 5 |
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| 58 | apcu_add | 27.57% | 0 |
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| 59 | getcwd | 27.49% | 1 |
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| 60 | strtoupper | 27.42% | 6 |
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| 61 | is_numeric | 26.95% | 9 |
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| 62 | array_unique | 26.91% | 4 |
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| 63 | ltrim | 26.60% | 4 |
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| 64 | basename | 26.57% | 4 |
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| 65 | str_repeat | 26.26% | 7 |
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| 66 | fopen | 25.91% | 6 |
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| 67 | array_slice | 24.94% | 3 |
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| 68 | getenv | 24.94% | 4 |
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| 69 | var_export | 24.71% | 3 |
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| 70 | preg_match_all | 24.67% | 3 |
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| 71 | is_callable | 24.48% | 4 |
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| 72 | reset | 24.44% | 4 |
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| 73 | preg_split | 24.40% | 3 |
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| 74 | fclose | 24.36% | 5 |
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| 75 | array_unshift | 24.25% | 3 |
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| 76 | gettype | 24.21% | 4 |
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| 77 | end | 23.90% | 3 |
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| 78 | array_search | 23.82% | 3 |
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| 79 | max | 23.78% | 5 |
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| 80 | extension-loaded | 23.59% | 3 |
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| 81 | is_bool | 23.55% | 2 |
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| 82 | version_compare | 22.82% | 3 |
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| 83 | preg_quote | 22.78% | 3 |
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| 84 | time | 22.70% | 9 |
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| 85 | ucfirst | 22.66% | 4 |
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| 86 | ksort | 22.66% | 2 |
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| 87 | preg_replace_callback | 22.54% | 3 |
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| 88 | md5 | 22.51% | 4 |
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| 89 | array_reverse | 22.47% | 2 |
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| 90 | array_diff | 22.12% | 2 |
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| 91 | is_readable | 22.00% | 1 |
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| 92 | microtime | 21.96% | 4 |
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| 93 | copy | 21.81% | 1 |
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| 94 | parse_url | 21.81% | 2 |
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| 95 | is_null | 21.50% | 17 |
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| 96 | base64_encode | 21.42% | 3 |
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| 97 | current | 21.38% | 2 |
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| 98 | is_resource | 21.08% | 3 |
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| 99 | serialize | 20.77% | 4 |
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| 100 | key | 20.57% | 2 |
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Source: https://www.exakat.io/en/the-100-php-functions/

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