What is the difference between elseif and else if in php?

If the statement after the conditional judgment of the if statement is enclosed in curly braces, the meanings of elseif and elseif are the same, and there is no difference; but if the statement after the conditional judgment of the if statement uses ":" Definition, you can only use elseif, otherwise PHP will generate a parsing error.

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The difference between elseif and elseif in PHP

When I was writing the code, I found that both else if and elseif can be used. Both syntaxes will not report errors. The difference between them is actually very small

elseif and else if are considered to be identical only when curly braces are used in the following example. If you use a colon to define the if/elseif condition, you cannot use the two-word else if, otherwise PHP will generate a parsing error.

In other words, as long as you add curly braces

{}, there is actually no difference between them, such as:

if ($a > $b) {
    echo 'a > b';
} elseif ($a == $b) {
    echo 'a = b';
} else if ($a < $b) {
    echo 'a < b';
}

On the contrary, if you use a colon

: To define, you can only use one-word elseif, such as:

/* 不正确的使用方法： */
if($a > $b):
    echo $a." is greater than ".$b;
else if($a == $b): // 将无法编译
    echo "The above line causes a parse error.";
endif;

/* 正确的使用方法： */
if($a > $b):
    echo $a." is greater than ".$b;
elseif($a == $b): // 注意使用了一个单词的 elseif
    echo $a." equals ".$b;
else:
    echo $a." is neither greater than or equal to ".$b;
endif;

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