PHP imap_binary() Function Last Updated : 28 Apr, 2025 Comments Improve Suggest changes Like Article Like Report The imap_binary() function is an inbuilt function in PHP that is used to convert the 8-bit string into the base64 encoding. This function is used by some IMAP servers to represent mailbox names that contain non-ASCII characters or certain ASCII characters that are special in IMAP. Syntax: imap_binary(string $string) : string | falseParameters: This function accepts only one parameter which is described below. $string: This is the string parameter that contains the 8-bit string.Return Values: The imap_binary() function if successfully executed will return a base64 encoded string otherwise this function will return "false". Note: Before using this function check if this is available in your environment or not. If not, then type this command apt-get install php-imapReferences: How to Install imap extension in PHP on Windows?How to Install imap extension in PHP on Linux? Program 1: The following program demonstrates the imap_binary() function. PHP <?php $string = "geeksforgeeks"; $eightBitData = imap_binary($string); // Output the result echo "Original data: $string\n"; echo "Converted base64 data: $eightBitData\n"; ?> Output: Original data: geeksforgeeksConverted base64 data: Z2Vla3Nmb3JnZWVrcw==Program 2: The following program demonstrates the imap_binary() function. PHP <?php $utf7data1 = "&ZeVnLIqe-"; $utf7data2 = "&BfAEEAbABlAG4ALwA-"; // Check if the imap_binary() function exists if (function_exists("imap_binary")) { $eightBitData1 = imap_binary($utf7data1); $eightBitData2 = imap_binary($utf7data2); // Output the results echo "Original UTF-7 data 1: $utf7data1\n"; echo "Converted 8-bit data 1: $eightBitData1\n\n"; echo "Original UTF-7 data 2: $utf7data2\n"; echo "Converted 8-bit data 2: $eightBitData2\n"; } else { echo "imap_binary() function is not available" . " in this environment.\n"; } ?> Output: Original UTF-7 data 1: &ZeVnLIqe-Converted 8-bit data 1: JlplVm5MSXFlLQ==Original UTF-7 data 2: &BfAEEAbABlAG4ALwA-Converted 8-bit data 2: JkJmQUVFQWJBQmxBRzRBTHdBLQ==Reference: https://www.php.net/manual/en/function.imap-binary.php Comment More infoAdvertise with us Next Article PHP imap_binary() Function neeraj3304 Follow Improve Article Tags : PHP PHP-function PHP-IMAP Similar Reads PHP Tutorial PHP is a widely used, open-source server-side scripting language primarily designed for web development. It is embedded directly into HTML and generates dynamic content on web pages, making it essential for building data-driven websites. It allows developers to handle database interactions, session 9 min read Top 60+ PHP Interview Questions and Answers -2025 PHP is a popular server-side scripting language, widely known for its efficiency in web development and versatility across various platforms. 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