How to use javascript and php keyword search functions

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javascript：

a. Code:

/*@desc： js search function, can be used for keyword matching @param key keyword @param str string to search @return out matching keyword before and after the position */function search(key,str){var min = 0var max = str.lengthvar index = str.indexOf(key)var left = index - 10var right = index + 10if(leftmax){ right = max}var out = str.slice(left,right)return out}

b. Testing:

var str = 'How are you? Where are you? Can I come over and play with you? Why don't you answer me! var res = search(key,str)console.log(res)

c. Output:

Liya? Can I come over and play with you? why didn't you answer me

php：

a. Code: