what is the functionality of function strstr and stristr, PHP Form Handling , PHP

Question:What is the functionality of the function strstr and stristr?

Answer strstr: It returns the remainder of a string beginning with the first occurrence of a predefined string.
stristr: same as strstr except the search of for the pattern is case insensitive.

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What is the functionality of the function strstr and stristr?

Question:What is the functionality of the function strstr and stristr?

Answer strstr: It returns the remainder of a string beginning with the first occurrence of a predefined string.stristr: same as strstr except the search of for the pattern is case insensitive.

Question:
What is the functionality of the function strstr and stristr?

Answer
strstr: It returns the remainder of a string beginning with the first occurrence of a predefined string.
stristr: same as strstr except the search of for the pattern is case insensitive.