concatenation
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string+string, string+number, string+variable
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use dot to concatenate
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echo 'the result is :' .$z;
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echo $x.' +'. $y.' ='.$z;
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150 + 150 = 300
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take the require things
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$x
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$y
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$z
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operators
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+
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=
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$x .'
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+
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. $y
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.'
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=
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.
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$z
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