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                1.str_replace — 子字符串替換 mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] ) 該函數返回一個字符串或者數組。該字符串或數組是將 subject 中全部的 search 都被 replace 替換之后的結果。 2.substr_replace — 替換字符串的子串 mixed substr_replace ( mixed $string , mixed $replacement , mixed $start [, mixed $length ] ) substr_replace() 在字符串 string 的副本中將由 start 和可選的 length 參數限定的子字符串使用 replacement 進行替換。 3.str_ireplace — str_replace() 的忽略大小寫版本 mixed str_ireplace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )
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