English
English
is_integer() is a built-in PHP function used to check if a variable is an integer. It returns a boolean value: true if the variable is an integer, and false otherwise.
Example:
<span><span><span class="hljs-variable">$var1</span></span><span> = </span><span><span class="hljs-number">10</span></span><span>;
</span><span><span class="hljs-variable">$var2</span></span><span> = </span><span><span class="hljs-number">3.14</span></span><span>;
</span><span><span class="hljs-variable">$var3</span></span><span> = </span><span><span class="hljs-string">"10"</span></span><span>;
<p></span>echo </span>is_integer(</span>$var1); </span>// outputs true<br>
</span>echo </span>is_integer(</span>$var2); </span>// outputs false<br>
</span>echo </span>is_integer(</span>$var3); </span>// outputs false<br>
</span></span>is_int() is another built-in PHP function. It has the same functionality as is_integer(), used to determine whether a variable is an integer.
Example:
<span><span><span class="hljs-variable">$var1</span></span><span> = </span><span><span class="hljs-number">10</span></span><span>;
</span><span><span class="hljs-variable">$var2</span></span><span> = </span><span><span class="hljs-number">3.14</span></span><span>;
</span><span><span class="hljs-variable">$var3</span></span><span> = </span><span><span class="hljs-string">"10"</span></span><span>;
<p></span>echo </span>is_int(</span>$var1); </span>// outputs true<br>
</span>echo </span>is_int(</span>$var2); </span>// outputs false<br>
</span>echo </span>is_int(</span>$var3); </span>// outputs false<br>
</span></span>In fact, is_integer() and is_int() have no real functional difference. Their purpose, parameter types, and return values are identical. The only difference is in their names.
is_int() is the function name officially recommended by PHP. According to the official documentation, is_int() is more concise and follows PHP naming conventions. Although is_integer() is valid syntax-wise, it exists alongside is_int() for historical reasons.
While is_integer() and is_int() can be used interchangeably, for code consistency and readability, it is recommended to use is_int(). This aligns better with the naming style of other PHP built-in functions.
From a performance standpoint, there is no significant difference between is_integer() and is_int(). Since their underlying implementation is identical, execution speed is nearly the same. Developers do not need to worry about performance and can choose either function based on personal or team coding habits.
In practical development, we usually choose type-checking functions based on requirements. For checking integer types, using is_int() aligns with PHP’s standard naming convention and is easier for other developers to understand. Although is_integer() works, it is an older naming style, and is_int() offers better readability.
Recommendation:
<span><span><span class="hljs-comment">// Recommended to use is_int()</span></span><span>
</span><span><span class="hljs-variable">$var</span></span><span> = </span><span><span class="hljs-number">42</span></span><span>;
<p></span>if (is_int(</span>$var)) {<br>
</span>echo </span>"The variable is an integer";<br>
} else {<br>
echo </span>"The variable is not an integer";<br>
}<br>
</span>Besides is_int() and is_integer(), PHP offers a range of built-in functions to check variable types. For example:
is_float() or is_double(): Checks whether a variable is a floating-point number.
is_string(): Checks whether a variable is a string.
is_array(): Checks whether a variable is an array.
is_bool(): Checks whether a variable is a boolean.
Choosing the appropriate function based on the requirement helps developers perform type checks and conditional logic more efficiently.
