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                # PHP substr_count() 函數 ## 定義和用法 substr_count() 函數計算子串在字符串中出現的次數。 ### 語法 ``` substr_count(_string_,_substring_,_start_,_length_) ``` | 參數 | 描述 | | --- | --- | | _string_ | 必需。規定要檢查的字符串。 | | _substring_ | 必需。規定要檢索的字符串。 | | _start_ | 可選。規定在字符串中何處開始搜索。 | | _length_ | 可選。規定搜索的長度。 | ## 例子 ``` <?php echo substr_count("Hello world. The world is nice","world"); ?> ``` 輸出: ``` 2 ```
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