PHP Comparison Operators: Comparing Values in PHP
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Table of Content:
- Example: == Equal
- Output:
- Example: === Identical
- Output:
- Example: != Not equal
- Output:
- Example: <> Not equal
- Output:
- Example: !== Not identical
- Output:
- Example: > Greater than
- Output:
- Example: < Less than
- Output:
- Example: >= Greater than or equal to
- Output:
- Example: <= Less than or equal to
- Output:
- Example: <=> Spaceship
- Output:
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The PHP comparison operators are used to compare two values (number or string):
| Operator | Name | Example | Result |
|---|---|---|---|
| == | Equal | $x == $y | Returns true if $x is equal to $y |
| === | Identical | $x === $y | Returns true if $x is equal to $y, and they are of the same type |
| != | Not equal | $x != $y | Returns true if $x is not equal to $y |
| <> | Not equal | $x <> $y | Returns true if $x is not equal to $y |
| !== | Not identical | $x !== $y | Returns true if $x is not equal to $y, or they are not of the same type |
| > | Greater than | $x > $y | Returns true if $x is greater than $y |
| < | Less than | $x < $y | Returns true if $x is less than $y |
| >= | Greater than or equal to | $x >= $y | Returns true if $x is greater than or equal to $y |
| <= | Less than or equal to | $x <= $y | Returns true if $x is less than or equal to $y |
| <=> | Spaceship | $x <=> $y | Returns an integer less than, equal to, or greater than zero, depending on if $x is less than, equal to, or greater than $y. Introduced in PHP 7. |
Example: == Equal
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">100</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="str">"100"</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">==</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns true because values are equal</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: === Identical
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">200</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="str">"100"</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">===</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns false because types are not equal</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">false</span><span class="pun">)</span><span class="pln"> </span>
Example: != Not equal
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">20</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="str">"20"</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">!=</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns false because values are equal</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">false</span><span class="pun">)</span><span class="pln"> </span>
Example: <> Not equal
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">20</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="str">"20"</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun"><></span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns false because values are equal</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">false</span><span class="pun">)</span><span class="pln"> </span>
Example: !== Not identical
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">100</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="str">"100"</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">!==</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns true because types are not equal</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: > Greater than
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">90</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="lit">50</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">></span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns true because $x is greater than $y</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: < Less than
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">20</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="lit">50</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun"><</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns true because $x is less than $y</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: >= Greater than or equal to
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">70</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="lit">70</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">>=</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns true because $x is greater than or equal to $y</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: <= Less than or equal to
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">60</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="lit">60</span><span class="pun">;</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun"><=</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns true because $x is less than or equal to $y</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: <=> Spaceship
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">5</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="lit">10</span><span class="pun">;</span><span class="pln"> echo </span><span class="pun">(</span><span class="pln">$x </span><span class="pun"><=></span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns -1 because $x is less than $y</span><span class="pln"> echo </span><span class="str">"<br>"</span><span class="pun">;</span><span class="pln"> $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">10</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="lit">10</span><span class="pun">;</span><span class="pln"> echo </span><span class="pun">(</span><span class="pln">$x </span><span class="pun"><=></span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns 0 because values are equal</span><span class="pln"> echo </span><span class="str">"<br>"</span><span class="pun">;</span><span class="pln"> $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">15</span><span class="pun">;</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> </span><span class="lit">10</span><span class="pun">;</span><span class="pln"> echo </span><span class="pun">(</span><span class="pln">$x </span><span class="pun"><=></span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// returns +1 because $x is greater than $y</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="pun">-</span><span class="lit">1</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="lit">1</span><span class="pln"> </span>
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