How can you determine if a variable consists only of spaces in PHP?

To determine if a variable consists only of spaces in PHP, you can use the `trim()` function to remove any leading and trailing spaces from the variable and then check if the resulting string is empty. If the variable contains only spaces, the trimmed string will be empty. 

$variable = "   "; // variable with only spaces

if (empty(trim($variable))) {
    echo "Variable consists only of spaces.";
} else {
    echo "Variable contains other characters besides spaces.";
}

Keywords

PHP variable spaces trim empty

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