IntlChar::isblank() function in PHP

The IntlChar::isblank() function checks whether the entered value is a blank or horizontal space character. This function is part of PHP's Internationalization extension and follows Unicode standards for character classification.

Syntax

IntlChar::isblank(val)

Parameters

• val − An integer or character encoded as a UTF-8 string representing a Unicode code point.

Return Value

The IntlChar::isblank() function returns TRUE if the entered value is a blank or horizontal space character, FALSE otherwise. Returns NULL on failure.

Example

The following example demonstrates how to use IntlChar::isblank() with different characters ?

<?php
    var_dump(IntlChar::isblank(" "));      // Space character
    echo "<br>";
    var_dump(IntlChar::isblank("\t"));     // Tab character
    echo "<br>";
    var_dump(IntlChar::isblank("A"));      // Letter
    echo "<br>";
    var_dump(IntlChar::isblank("8"));      // Digit
    echo "<br>";
    var_dump(IntlChar::isblank("<br>"));     // Newline (not blank)
?>

Output

The output of the above code is ?

bool(true)
bool(true)
bool(false)
bool(false)
bool(false)

Key Points

• Blank characters include space (U+0020) and horizontal tab (U+0009)

• Newline characters are not considered blank characters

• The function follows Unicode character properties for classification

Conclusion

The IntlChar::isblank() function is useful for validating horizontal whitespace characters in Unicode text processing. It specifically identifies space and tab characters while excluding other whitespace like newlines.