php how to query string occurrence position

How does php query where the string appears

This article will introduce "how to query the location of strings in php" in detail. The content is detailed, the steps are clear, and the details are handled properly. I hope this article "How to query the location of strings in php" can helpLet’s solve your doubts, follow the ideas of the editor to slowly deepen, and let’s learn new knowledge together.

4 methods: 1. Use stripos() to return the position of the first occurrence (case-insensitive), syntax "stripos(string, query value)"; 2. Use strpos() to return the first occurrenceThe position of the second occurrence (case sensitive), the syntax "strpos(string, query value)"; 3. Use strripos() to return the position of the last occurrence, the syntax "strpos(string, query value)"; 4.With strrpos(), the syntax "strrpos(string, query value)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

Method 1: Use the stripos() function

The

stripos() function finds the first occurrence of a string within another string (case-insensitive).

Return value: Returns the position of the first occurrence of the string in another string, or FALSE if the string is not found.Note: String positions start at 0, not 1.

";$find="world";echo "Specify where the substring world appears: ".stripos($str,$find);?>

Method 2: Use the strpos() function

The

strpos() function finds the first occurrence of a string within another string (case-sensitive).

Return value: Returns the position of the first occurrence of the string in another string, or FALSE if the string is not found.

";$find1="php";echo "Specify where the substring php appears: ".strpos($str,$find1)."
";$find2="PHP";echo "Specify where the substring PHP appears: ".strpos($str,$find2);?>

Method 3: Use the strripos() function

The

strripos() function finds the last occurrence of a string within another string (case-insensitive).

Return value: Returns the position of the last occurrence of the string in another string, or FALSE if the string is not found.

";$find1="php";echo "Specify where the substring php appears: ".strripos($str,$find1)."
";$find2="PHP";echo "Specify where the substring PHP appears: ".strripos($str,$find2);?>

Method 4: Use the strrpos() function

The

strrpos() function finds the last occurrence of a string within another string (case-sensitive).

Return value: Returns the position of the last occurrence of the string in another string, or FALSE if the string is not found.

";$find1="php";echo "Specify where the substring php appears: ".strrpos($str,$find1)."
";$find2="PHP";echo "Specify where the substring PHP appears: ".strrpos($str,$find2);?>

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